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Invertebrates
Lovely story from [The Guardian](https://www.theguardian.com/lifeandstyle/article/2024/jun/28/experience-a-leech-lived-up-my-nose-for-a-month) >It was September 2014. I’d just started working front of house in a fancy hotel in Edinburgh. I spent most of my shifts with a paper napkin pressed to my nostril, as I had been getting lots of nosebleeds. I would soon find out why. > >A few weeks earlier, I’d been travelling in Vietnam. I had rented a moped and had the time of my life driving around. I soon crashed but luckily was wearing a helmet, so only got a small bump on my head. > >A few days afterwards, I started to intermittently spot blood from my right nostril. I assumed it was from the crash and didn’t think too much of it. I was 24 and too busy partying to take anything like that seriously. I danced the nights away while ignoring the persistent blockage in my nose. > >Reality came flooding back after returning to cold Glasgow. Nothing had changed with my nose, so I went to the GP. The doctor told me that it didn’t sound like anything to worry about. I was advised to use Vaseline on the area to keep the nostril lubricated and was sent on my way. > >A week later, I moved to Edinburgh for my job. That’s when I started to feel frustrated with my constantly stuffy nose. I wasn’t in pain, but sleeping was difficult. I would blow my nose to try to clear the blockage, but it would only lead to nosebleeds. Things started to get particularly weird when I was having showers. Through all the humidity, I could feel a thick, slimy thing moving down my nose. > >I had a day off work; it had been a month since I returned from abroad. My friend Jenny was coming from Glasgow to meet me for dinner. I was in the shower when I felt the all-too-familiar feeling, but this time I glimpsed something hanging out of my nostril. I jumped out and raced to the mirror, frantically wiping off the steam. I saw a clot hanging out – then recoiled in horror when I saw ridges running along a thick black body. > >I rushed out of the house to see my friend, screaming, “It’s a full-on worm!” Jenny knew about the problems I’d been having with my nose, but she didn’t believe me at first. I stuck my nose in the air so that she could see for herself. Her mouth hung wide as she gaped and said: “Yep, there really is a worm in there.” > >At first, it was the most hysterical thing that had ever happened to us. We couldn’t stop laughing. Because it had been in there for so long, I felt very blase about the whole thing. We rang the NHS helpline. The call adviser was crying tears of laughter over the phone, as it was the most bizarre thing she’d heard. > >We went to A&E. Doctors were bewildered and didn’t take me too seriously at first. But once the nurse looked up my nose, she gasped. I was placed on a gurney as they stretched my nostril open with forceps. The doctors spent 30 minutes using different tools to try to prise the leech away. Leeches release an anaesthetic when they bite so they can stay on a body for longer, which is why I couldn’t feel the pain before – but it was agony when the doctors tried to pull it out. When they finally succeeded, I felt a wave of cold air shooting through the blocked nostril. It was like being in a nightmare, seeing the leech held up high, squirming. It was longer than my finger. > >I’d swum a lot on holiday, so we guessed that it most likely came from there rather than having anything to do with the motorcycle accident. The leech was put in a jar and sent to a specialist hospital in London for further testing – they were worried that it may have passed on further diseases to me. Suddenly, something that was so funny seemed much more serious. > >Luckily, all of my tests came back clear, and I had no side-effects. I was given the leech back in a pot and told to dispose of it. The leech was rock hard because it had so much of my blood inside. It made me squirm just looking at it. > >Now, a decade later, the story of the leech and me has become a go-to anecdote whenever I meet someone new. I even had someone message me on LinkedIn recently asking about it. So while the leech was attached to me in a very physical sense, I guess we’re still attached metaphorically. But I’m very glad it’s out.
Main photo by [Ocean Networks Canada](https://www.flickr.com/photos/oceannetworkscanada/9678458149/)  Above photo via [MBARI](https://www.mbari.org/animal/sea-pig/) Sea Pigs (Scotoplanes) are a type of Sea Cucumber They live in the deep sea, specifically on the abyssal plain up to depths of 5000m They can grow up to 4-6 inches They have 6 pairs of enlarged tubal 'feet', and use water cavities in their bodies to inflate and deflate them in order to move around, as well as ten buccal tentacles lining their oral cavity  Above photo via [Ocean Networks Canada](https://www.flickr.com/photos/oceannetworkscanada/9775853991/in/album-72157635258422453/) They live on the sea floor feeding on delicious foods such as decaying animals, poo and mucus! If they are disturbed they can swim! In fact some Sea Pigs spend most of their lives swimming around in the water column using their frontal and anal lobes to propel themselves around! They will gather in large numbers around whale corpses to feed and perhaps find a mate  Above, a congregation of Sea Pigs feeding on a whale carcass via [MBARI](https://www.mbari.org/animal/sea-pig/) Their reproductive system is unique, the males only have one testis, and the females one ovary! Also their skin contains a toxin called holothurin which is poisonous to predators... They have a poorly defined respiratory system, and have to breathe through their anus!  Above photo by Oceans Network Canada via [Treehugger](https://www.treehugger.com/sea-pigs-facts-4864441) As they have evolved at deep sea depths they would swell and burst if brought to the surface They are hosts to several parasitic invertebrates, including snails and small crustaceans But wait! What's this...?  Above Above photo via [MBARI](https://www.mbari.org/animal/sea-pig/) What's that red thing hiding under the Sea Pig?  Above photo via [wikipedia](https://en.wikipedia.org/wiki/File:Scotoplanes_globosa_and_crab.jpg) It's a King Crab!  Above photo via [MBARI](https://www.mbari.org/animal/sea-pig/) Peek-a-boo!  Above photo by Josi Taylor via [MBARI](https://www.mbari.org/news/young-king-crabs-found-hitchhiking-on-sea-pigs/) Why do King Crabs ride on Sea Pigs? Usually King Crabs like to hide in rocks and seaweed from predators, but it is thought that these King Crabs were carried by the ocean current while they were small larvae and ended up in the deep sea....an area devoid of such hiding places! >“It’s like looking for a port in the storm,” said James Barry, ecologist and lead author of the study at the Monterey Bay Aquarium Research Institute (MBARI) in Moss landing. Sea cucumbers are the ports or the biggest buildings to hide next to in an otherwise empty area.” [Scientific American](https://www.scientificamerican.com/blog/guest-blog/why-are-juvenile-crabs-hitching-rides-on-sea-pigs/)  Above, ' This photograph of the muddy seafloor offshore of Monterey Bay shows three Scotoplanes sea cucumbers, at least two of which are host to juvenile king crabs.' [MBARI](https://www.mbari.org/news/young-king-crabs-found-hitchhiking-on-sea-pigs/) >Barry and his team found a total of 600 juvenile crabs, 96 percent of which were either clinging onto sea cucumbers or hanging around right next to them. Sometimes the crabs were upside down holding onto the belly of the sea pig and other times they were crawling on its side. In some cases, the researchers found more than one crab on a sea cucumber. Of the nearly 2,600 sea cucumbers videotaped, 22 percent had at least one juvenile crab clinging to them Goodbye Sea Pig, and your King Crab jockey!  Above photo via [MBARI](https://www.mbari.org/animal/sea-pig/) edit- I completely forgot to add my sources.....[wikipedia](https://en.wikipedia.org/wiki/Scotoplanes) and [MBARI](https://www.mbari.org/news/young-king-crabs-found-hitchhiking-on-sea-pigs/), unless specified
www.theguardian.com
 >Remnants of prehistoric worm Radnorscolex latus, unearthed in Herefordshire. Photograph: Richie Howard/Luke Parry/National History Museum/PA > > >An ancient worm unearthed in Herefordshire was a carnivorous predator that shoved its throat out to catch and eat prey, according to scientists. > >The creature, named Radnorscolex latus, was found at a disused Victorian quarry site in the village of Leintwardine, near the Welsh border. > >This marine worm is believed to have lived on the ocean floor about 425m years ago, when the region was under water. Analysis suggests it had a retractable throat that could extend out on to the seabed to capture prey hidden within the sediment. > >According to Dr Richie Howard, curator of fossil arthropods at the [Natural History Museum,](https://www.theguardian.com/culture/natural-history-museum) Radnorscolex is reminiscent of giant worms in the Hollywood blockbuster Dune. > >Howard said: “We think they weren’t too picky when it came to feeding and likely just shoved their throat out into the mud and grabbed anything they could find. > >“They certainly make you think of the sandworms in Dune in that respect.” > >Although fossil remains of Radnorscolex were first discovered a century ago, the technology was not advanced enough to allow palaeontologists to examine these in great detail. > >Experts from the Natural History Museum in London used state-of-the-art imaging techniques to analyse the remnants. > >Findings showed Radnorscolex had rows of sharp teeth and hooks on its head, which it would have used to anchor itself to the ground and drag its body forward to move. > >Despite being a predator, analysis suggests the creature only grew to be about 8cm long. > >The researchers said Radnorscolex belongs to a group of extinct worm-like animals known as Palaeoscolecids, which were wiped out completely about 400m years ago due to rapid climate and sea level change. > >The findings are published in the journal Papers in [Palaeontology.](https://www.theguardian.com/science/palaeontology) Image and text from the original article in [The Guardian](https://www.theguardian.com/science/article/2024/may/23/remnants-of-prehistoric-marine-worm-unearthed-in-herefordshire)
Main photo by [Dusan Beno](https://www.flickr.com/photos/29855281@N06/5867100103/in/pool-insects-studio-stacks/)  Above, 'Chrysis semicincta' by [Jessica JOACHIM](https://www.flickr.com/photos/tifaeris/48821515013/in/gallery-42145526@N03-72157720322864224/)  Above, 'Cotinis Mutabilis, also known as the Figeater Beetle' by [Cotinis Mutabilis](https://www.flickr.com/photos/tanneryates/6024877920/in/pool-insects-studio-stacks/)  Above photo by [philux66](https://www.flickr.com/photos/pcoffe/51975661218/in/pool-insects-studio-stacks/)  Above, 'Green Tortoise Beetle, Cassida viridis' by [Duncan Cooke](https://www.flickr.com/photos/happydayzphotography/52077353016/in/pool-world_wide_amazing_nature/) >Length; 7 - 10mm. > >Distribution; Widespread in England and Wales, although sparse in the north and rarer in Scotland. > >Habitat; Grassland, Heathland & Moorland, Farmland, Wetlands, Woodland & Gardens. > >Found; April to October. > >The Green Tortoise Beetle is one of a group of several closely related beetles. Host plants include White Dead-nettle, Hemp Nettles, Hedge Woundwort, Gypsywort and Water Mint and is often found in gardens. When disturbed, the adults behave just like tortoises, retracting their antennae and feet, and pulling their 'shell' tight down around them as they grip tightly on to the leaf they are. > >The Green tortoise beetle is round, flattened and lime green. Tortoise beetles are easy to identify as a group, but there are several closely related species that are very difficult to tell apart. the Green Tortoise Beetle is entirely green and generally lacks the markings of other species. Cassida viridis is similar to Cassida rubiginosa but can be distinguished by the rounded rear corners of the pronotum which are sharp in C. rubiginosa. It is also usually more apple green in colour. > >Adults spend a few weeks feeding on host foliage and possibly also pollen before mating in April and May and ovipositing from May to July. Between 1 and 10 eggs laid in firm-walled and distinctive egg cases which are stuck to stems or under lower leaves and covered with frass and leaf fragments. They hatch within 6 to 10 days and the larvae initially feed below the leaves, moving to the upper surface as they grow, they pass through 5 instars and develop rapidly. They are fully grown within 4 to 6 weeks. > >Pupation occurs from June to September. The fully grown larvae move to stems and petioles and become attached by a secretion before they pupate. This stage is also brief, generally lasting about a week, and new generation adults emerge from July to October.  Above 'Green vegetable or Shield bug' by [Bernard Spragg. NZ](https://www.flickr.com/photos/volvob12b/52651443368/in/pool-world_wide_amazing_nature/) >Nezara viridula, commonly known as the southern green stink bug, southern green shield bug or green vegetable bug, is a plant-feeding stink bug. Believed to have originated in Ethiopia, it can now be found around the world.  Above, 'Golden Beetle' by [Ivan Anisimov](https://www.flickr.com/photos/outstanding_macro/53611793101/in/pool-closeupandmacrophotograpygroup/)
-Leeches are found all across the world, except Antarctica, so far around 700 species of leech have been described. Approximately 100 are marine, 480 freshwater and the remainder are terrestrial different species…. All of these are divided into 2 major infraclasses >1. Euhirudinea: the 'true' leeches – marine, freshwater and terrestrial – which have suckers at both ends and lack chaetae (bristles) > > >2. Acanthobdellida: a small northern hemisphere infraclass ectoparasitic on salmoniid fish, which lack an anterior sucker and retain chaetae. > > >The Euhirudinea is further divided into two orders: > > 1. Rhynchobdellida: jawless marine and freshwater leeches with a protrusible proboscis and true vascular system > >2. Arynchobdellida: jawed and jawless freshwater and terrestrial leeches with a non-protrusible muscular pharynx and a haemo-coelomic system. [source](https://australian.museum/learn/animals/worms/leeches/#top)  Above image from [here](https://www.researchgate.net/profile/Muzaffer-Durmus/publication/305690889/figure/fig1/AS:483042151145472@1492177631675/Anatomy-of-Hirudo-medicinalis-the-first-defined-by-Hippocrates-460-370-BC-who.png) -Leeches are segmented parasitic or predatory worms, and are closely related to earthworms -They have suckers at both ends of their bodies and use them to travel around by ‘looping’ or ‘crawling.’ Some species can also swim like an eel  Above image by Chiswick Chap via [wikipedia](https://en.wikipedia.org/wiki/File:Leech_looping_locomotion.jpg) -All leeches are hermaphrodites, although they prefer to find a mate to exchange sperm packets with….. -They can live in both fresh and salt water, and there are some which are terrestrial, living on the ground or on low growing plants waiting for a meal to brush past -Some species can even survive extremely dry conditions by burrowing into the soil where they can stay without any water. Their bodies contract, becoming dry and rigid, but within 10 minutes of water contact they emerge, ready to go! -The most famous type of leech is probably the European medicinal leech (Hirudo medicinalis), which was used extensively in the past (the first recorded case being Ancient Egypt 3500 years ago). Its populations in the wild have dropped significantly due to over exploitation for the medical industry  Photo by [Neil Phillips](https://www.flickr.com/photos/ukwildlife/15365527517/) -Manchester Royal Infirmary used 50,000 leeches in one year in 1831, but use of the medicinal leech started to decline during the late 19th century. However, since the 1970’s they have made a comeback due to their use in micro surgery. Their anti coagulant saliva allows blood to keep flowing, and wounds to stay open during reattachment and reconstructive surgery!  Photo by [Armando Caldas](https://www.flickr.com/photos/8793530@N03/4086985444/) -Hirudo medicinalis are ‘jawed’ leeches (Gnathobdellida). They have 3 jaws resembling rotary saws which have around 100 sharp edges used to incise the host which leaves a Y shape wound on the skin. They are so tiny their bite is virtually painless. Blood suckers are only one type of leech though... -Other species of jawed leeches can have between 1 and 3 jaws. Detrivorous species use their jaws for chewing and swallowing soft food particles, whilst the carnivores use them to cut a hole in the body walls of invertebrate prey (molluscs, worms, insect larvae), in order to suck out the soft innards.  Photo by [Manuel Krueger-Krusche](https://bogleech.com/leeches) -The largest fresh water leech in the world is Haementeria ghilianii, (the Amazon giant leech) which can grow up to 450mm long and 100mm wide. One end of the leech contains its head, and the other the proboscis, which is 10cm long and like a hypodermic needle. It is capable of feeding on humans, rabbits, cattle and horses and a report from 1899 claims it could feed in such numbers that it could kill cattle and birds  Photo by [Anonyme973](https://en.wikipedia.org/wiki/Haementeria_ghilianii#/media/File:Haementeria_ghilianii_4.jpg) -Its male reproductive parts can weigh 3-5 grams, and the female parts weigh in at 10 grams, they are capable of producing egg clutches ranging from 60 to 500 eggs -It was thought to be extinct in 1893, however during the 1970s Dr Roy Sawyer discovered 2 specimens in a pond in French Guiana. One of these was transferred to the UC Berkeley where it was part of a ‘breeding’ program. Named ‘Grandma Moses’ it managed to produce 750 offspring over 3 years, and helped to bring the Amazon Giant Leech back from the brink of extinction  [Dr. Roy Sawyer and friend](https://bogleech.com/leeches) photographed by Timothy Branning -When it died, ‘Grandma Moses’ was given to the Smithsonian National Invertebrate Collection where it still resides preserved in alcohol!  [The Grandma Moses leech](https://www.smithsonianmag.com/smithsonian-institution/the-list-5-weirdest-worms-at-the-smithsonian-47017905/) -A small minority of leech species have no jaws or teeth (these are the worm leeches or Pharyngobdellida). Instead they swallow their prey, usually small invertebrates, whole! -The Kinabalu giant red leech (Mimobdella buettikoferi) is probably one of the longest leeches, growing over 50cm.  Above photo from [here](https://zc-lovenaturewildlife-studio.blogspot.com/p/giant-red-leech-of-mount-kinabalu-sabah.html) -It lives only on Mt Kinabalu, Borneo and feeds on an equal giant prey, the Kinabalu giant earthworm (Pheretima darnleiensis)  Kinabalu giant earthworm, Photo by [Chien Lee](https://www.flickr.com/photos/25872797@N02/33381593598/in/gallery-42145526@N03-72157720322864224/)  Kinabalu giant earthworm, Photo by [Ivan Kwan](https://www.flickr.com/photos/hai_ren/4262577818/) -It lives among the leaf litter and soil, and both leech and worm are usually seen during or after a downpour….  Found [here](https://www.inaturalist.org/taxa/889425-Mimobdella-buettikoferi/browse_photos) >A hungry leech is very responsive to light and mechanical stimuli. It tends to change position frequently, and explore by head movement and body waving. It also assumes an alert posture, extending to full length and remaining motionless. This is thought to maximise the function of the sensory structures in the skin. [source](https://australian.museum/learn/animals/worms/leeches/#top)  Photo from [here](https://www.inaturalist.org/taxa/889425-Mimobdella-buettikoferi/browse_photos) -When it finds a worm it begins to grope towards an end, then it begins to suck….. [Here](https://www.bbc.co.uk/programmes/p027f9q0) is a delightful film of just that! Also on [youtube](https://www.youtube.com/watch?v=0fGGz6d3vC4&themeRefresh=1)   Above photos by [Paul Williams](https://www.flickr.com/photos/ironammonite/15366274391/) -Almost all leeches have at least one pair of tiny eyes, however some can have up to 16, these are arranged in patterns although their vision may only be able to detect light and dark.  Photo by [Paul](https://www.flickr.com/photos/rainforests/8316883892/in/gallery-quasimodo-72157660594159737/) -Glossiphoniid leeches demonstrate exceptional parental care for their offspring, which is the most highly developed for the annelids (the worm species). They produce a membranous bag in which they keep their eggs, this is carried on the underside of their bodies. When the young hatch they attach onto their parents belly (but not with a feeding bite) and the parent carries them to their first meal!  Above photo by [Maralee Joos](https://www.flickr.com/photos/wildflorida/5858291248/in/gallery-quasimodo-72157660594159737/)  Above photo by [Duncan Cooke](https://www.flickr.com/photos/happydayzphotography/7465798834/in/gallery-quasimodo-72157660594159737/)  Above photo by [Duncan Cooke](https://www.flickr.com/photos/happydayzphotography/7465798580/in/gallery-quasimodo-72157660594159737/) >Helobdella, which have a world-wide distribution, display the most highly developed parental care system: they not only protect but also feed the young they carry. This results in the young being much larger when they leave the parent and, presumably, in higher subsequent survival. [source](https://www.sciencedirect.com/science/article/abs/pii/S1431761304700336)  Above photo by [Dick Todd](https://www.flickr.com/photos/36044199@N00/11824464484/in/gallery-quasimodo-72157660594159737/) -Leeches are quite hardy, some can survive in low oxygen environments, others at low ocean depth such as…. >Bathybdella sawyeri occurs at 2447–2623 m depth at the Galápagos Rift and the Southeast Pacific Rise and Galatheabdella bruuni has been found at depths of 3880–4400 m in the Tasman Sea (Richardson and Meyer, 1973; Burreson, 1981; Burreson and Segonzac, 2006). However, the leech that occurs at the greatest depth is Johanssonia extrema described by Utevsky et al. (2019) that was collected at a depth of 8728.8 m in the Kuril-Kamchatka Trench. Occurring at that depth, J. extrema withstands pressure that is over 870 times greater than that at sea level. [source](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7569739/) -Some species have evolved to live within the extreme dark of caves, others to withstand the extreme cold of arctic waters, one lives in waters of high alkalinity with the addition of arsenic at levels >110mg/L >Members of Praobdellidae are characterized by feeding primarily from mucous membranes [mouth, throat, nasal passages, and under the eyelids] particularly of mammals, but also from the skin of amphibians. This behavior is considered equally unnerving by both academic and public audiences. [source](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7569739/) -A backpacker returning from Vietnam discovered she had also brought home a leech passenger that was attached inside her nostril "At one point, I could feel him up at my eyebrow," she said. It was removed at Liverpool Hospital, before it could reach her brain…. She than kept the leech named ‘Mr Curly’ as a pet…. delightful! -One other leech has evolved to live in another type of orifice...*a hippos anus!* >…...Placobdelloides jaegerskioeldi inhabits one of the most extreme environments of all of the leeches that invade orifices, the rectum of the hippopotamus (Oosthuizen and Davies, 1994). Adult P. jaegerskioeldi have papilla-bearing tubercules that are postulated to provide traction against the anal-wall of the hippopotamus (Oosthuizen and Davies, 1994). This species is also one of the few glossiphoniid leeches that can actively swim and swims (even upstream) to its hippopotamus host (Oosthuizen and Davies, 1994). [source](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7569739/) As always, I’m not and expert I just like finding and sharing fun things I find on the internet. Any mistakes or errors, let me know in the comments and I’ll edit my post! All information via wikipedia- [Leech](https://en.wikipedia.org/wiki/Leech) [Giant Amazon Leech](https://en.wikipedia.org/wiki/Haementeria_ghilianii) [Medicinal Leech](https://en.wikipedia.org/wiki/Hirudo_medicinalis) [Kinabalu Giant Leech](https://en.wikipedia.org/wiki/Kinabalu_giant_red_leech) [Glossiphoniidae](https://en.wikipedia.org/wiki/Glossiphoniidae) Except these- [Bogleech](https://bogleech.com/leeches) [Smithsonian Magazine](https://www.smithsonianmag.com/smithsonian-institution/the-list-5-weirdest-worms-at-the-smithsonian-47017905/) [Australian Museum](https://australian.museum/learn/animals/worms/leeches/#top) [buzzfeed](https://www.buzzfeednews.com/article/rachelzarrell/meet-mr-curly#40dnf0u) [Leeches in the extreme: Morphological, physiological, and behavioral adaptations to inhospitable habitats](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7569739/) [mentalfloss](https://www.mentalfloss.com/article/76821/10-juicy-facts-about-leeches) [The Evolution of Parental Care in Freshwater Leeches](https://www.sciencedirect.com/science/article/abs/pii/S1431761304700336)
Main photo 'Wasp' by [Joshua Coogler](https://www.flickr.com/photos/134685632@N07/51928456758/in/pool-insects-studio-stacks/)  Above, 'Pachyrrhynchus ocelatus' by [Raúl García Navarro](https://www.flickr.com/photos/160304944@N04/52029423095/in/pool-insects-studio-stacks/)  Above, 'Mite SP' by [Harry Sterken](https://www.flickr.com/photos/harrysterken/51991874677/in/pool-insects-studio-stacks/)  Above, 'Golofa claviger - Giant rhinoceros beetle' by [André De Kesel](https://www.flickr.com/photos/andredekesel/52102568867/in/pool-insects-studio-stacks/)  Above, 'Jumping spider SP (male)' by [Harry Sterken](https://www.flickr.com/photos/harrysterken/52261021618/in/pool-insects-studio-stacks/)  Above, 'Alcidodes Ocellatus' by [Raúl García Navarro](https://www.flickr.com/photos/160304944@N04/52058527033/in/pool-insects-studio-stacks/)
Title photo by [David Guillemet](https://www.flickr.com/photos/dguillemet/) I've only just discovered that this exists... Orangutan crab (Achaeus japonicus) >.....it has relatively long arms, which are thickly covered with fine hairs, red or reddish brown in colour, and often laden with small bits of debris for further camouflage.... > >....frequently, but not always, found in association with the bubble coral [wikipedia](https://en.wikipedia.org/wiki/Achaeus_japonicus)  Above photo by [scubaluna](https://www.flickr.com/photos/scubaluna/31076532444/) -They're found in the Indo-Pacific region, have a naturally shaggy pelt, and like to decorate themselves with debris, small plants, sedentary animals, shells and gravel to enhance their natural camouflage!  Above photo by [Bruce Versteegh](https://www.flickr.com/photos/bversteegh/5985756457/) -During the day like to hang out in Bubble Coral, which swells its bubble-like structures to maximise its intake of light....  Above photo by [Niall Deiraniya](https://www.flickr.com/photos/48625685@N07/9575026613/) -At night the coral 'deflates' and the Orangutan crab wanders off in search of food  Above photo by [Dennis Young](https://www.flickr.com/photos/dlyoung/53301565931/) The last 2 photos made me piss myself laughing....it looks like a fuzzy little muppet! Info from [wikipedia](https://en.wikipedia.org/wiki/Achaeus_japonicus) and [here](https://www.australiangeographic.com.au/blogs/creatura-blog/2014/05/orangutan-crab-a-decorator-expert/)
Title photo by [Dotted Yeti](https://a-z-animals.com/animals/anomalocaris/pictures/) >Travel back in time to the Cambrian Era, a period famous for the diversity of its life forms! > >Lasting approximately 53.4 million years from the end of the preceding Ediacaran period 538.8 million years ago (mya) to the beginning of the Ordovician period 485.4 mya. It is a period where the atmosphere had elevated concentrations of oxygen, and the global temperature increased-creating a temperate world > > > >Geological timescale from [here](https://www.sutori.com/en/story/geologic-time-scale--gaP3hEy5bkbZhpxTgfZSgREZ) > >Scientists believe that the higher oxygen levels, and warmer climate contributed to the incredible diversity of life that occurred in the oceans. > >However, on land it was mostly barren...complex lifeforms were non-existent and would have been restricted to mollusks and arthropods emerging from the water to feed on microbes in slimy biofilms > >The Cambrian is unique as it had unusually high deposits of Lagerstätte sedimentary deposits, these sites offer exceptional preservation of 'soft' organism parts, as well as their harder shells which means that the study and understanding of the fossilized life forms surpasses some of later periods (above, from my previous post on [Aysheaia](https://lemmy.ml/post/13725497)) Anomalocaris means 'unlike other shrimp' or 'abnormal shrimp' and is an extinct Cambrian arthropod belonging to the radiodonts (meaning, radius 'spoke of a wheel' and odoús 'tooth') and is thought to have been one of the top predators for it's time The fossils that were discovered in The Burgess Shale in 1886 were of incomplete segments and were initially thought to be 3 separate individual species. The frontal appendages were thought to be the bodies of shrimp-like crustaceans.  Above, 'named [Anomalocaris](https://www.trilobites.info/gallery.html) ("strange shrimp") by Walcott' The circular mouth part was thought to be a jellyfish as it showed the same radial symmetry  Above, 'circular fossil from the Burgess Shale formation was described and named [Peytoia](https://www.trilobites.info/gallery.html)' In 1966 a comprehensive revision of the Burgess Shale fossils began, along with additional misinterpretations which proposed that the feeding appendages were legs, and the mouth parts were part of a sponge... However, during the cleaning of one of the fossils a layer of stone was removed which linked the feeding appendages and the mouth parts as belonging to the same animal. Later specimens showed how the feeding appendages could be curled around prey and directed to the circular mouth part, as well as eyes on flexible stalks....It had taken over 100 years of misinterpretations to finally meet Anomalocaris  Above, previously thought as the 'body of a shrimp was one of a pair of spiny grasping arms..the rim of the mouth shows partially, as does one of the large eyes' [source](https://www.trilobites.info/gallery.html)  Above, 'appendages could curl, enfolding around prey, which was pinned by the arm spines. The captured prey was then placed into the mouth, which was under the head between the eyes. The eyes were at the ends of flexible stalks.' [source](https://www.trilobites.info/gallery.html) In 2021 the compound eyes made up of 16,000 lenses were discovered, proving that Anomalocaris was definitely an arthropod, and indicating that complex eyes has evolved before jointed legs or exoskeletons  Above photo by [John Paterson](https://www.nature.com/articles/nature.2011.9586), 'One of the stalked eyes of Anomalocaris from South Australia with arrows pointing to the boundary between the stalk and visual surface, plus the intricate lenses preserved' The Anomalocaris would have been huge for the Cambrian maybe up to 1 metre in length. It would have been able to swim through the water by undulating the flexible flaps on the sides of it's body chasing down prey. The compound eyes would have given it a 'high degree of visual acuity, and a well-developed brain to process that information' [source](https://www.nature.com/articles/nature.2011.9586)  Above, Anomalocaris size via [wikipedia](https://commons.wikimedia.org/wiki/File:Anomalocaris_canadensis_size_comparison.png) It's unusual mouth parts made of wrinkled structures and sharp teeth, plus grasping appendages would have been ideal to catch and eat soft bodied animals like worms or comb jellies  Above, Radiodonta oral cones [wikipedia](https://commons.wikimedia.org/wiki/File:20210520_Radiodonta_oral_cone.png)........looking rather like an anus with teeth, imo  Above image by [Junnn11](https://commons.wikimedia.org/wiki/Category:Anomalocaris_life_restorations#/media/File:2014_Anomalocaris_canadesis.png) Anomalocaris fossils have been discovered in Canada (Burgess Shale), Australia (Emu Bay Shale), China and the US and include species -A. canadensis Whiteaves, 1892 =A. whiteavesi Walcott, 1908 =A. gigantea Walcott, 1912 =A. cranbrookensis Resser, 1929 -A. daleyae Paterson, García-Bellidob & Edgecombe, 2023 [wikipedia](https://en.wikipedia.org/wiki/Anomalocaris#cite_note-Wu_2021-3) Plus 8 other species including - Anomalocaris saron, from the Chengjiang lagerstatten in China [source](https://www.trilobites.info/species.html)  Above, [Anomalocaris saron, a Radiodonta from the Chengjiang Biota, China](https://wp.unil.ch/paleo/page-exemple/exceptional-preservation/) The Anomalocaris died off towards the end of the Cambrian, during the Great Permian Extiction along with up to 90% of all other life forms  Above image by [Dotted Yeti](https://a-z-animals.com/animals/anomalocaris/pictures/) All info from [wikipedia](https://en.wikipedia.org/wiki/Anomalocaris#cite_note-Wu_2021-3), and also [here](https://www.trilobites.info/background.html), [here](https://www.nationalgeographic.com/premium/article/was-this-prehistoric-killer-shrimp-as-fierce-as-it-looked) and [here](https://a-z-animals.com/animals/anomalocaris/) As always, I am not an expert, I just enjoy learning and sharing interesting things....Any mistakes- leave a comment and I'll edit my post
Title photo by [Distinctly Average](https://www.flickr.com/photos/distinctly_average/48180252101/) Woodlice are crustaceans, and get their name from being found in wood, and 'louse' (a parasitic insect) however, they are neither insects or parasites! There are over 3500 species of woodlouse, and are found throughout the world except Antarctica  Above photo by [Nico Ardans](https://www.flickr.com/photos/nicoardans/1087627760/) Their ubiquity has resulted in many (up to 250) different local names for them including... - Boat-builder (Newfoundland, Canada) - Butcher boy or butchy boy (Australia, mostly around Melbourne) - Carpenter or cafner (Newfoundland and Labrador, Canada) - Cheeselog (Reading, England) - Cheesy bobs (Guildford, England) - Cheesy bug (North West Kent, Gravesend, England) - Chiggy pig (Devon, England) - Chisel pig - Chucky pig (Devon, Gloucestershire, Herefordshire, England) - Doodlebug (also used for the larva of an antlion and for the cockchafer) - Gramersow (Cornwall, United Kingdom) - Hog-louse - Millipedus - Mochyn coed ('tree pig'), pryf lludw ('ash bug'), granny grey in Wales - Pill bug (usually applied only to the genus Armadillidium) - Potato bug - Roll up bug - Roly-poly - Slater (Scotland, Ulster, New Zealand and Australia) - Sow bug - Woodbunter - Wood bug (British Columbia, Canada) - Wood pig (mochyn coed, Welsh) [source](https://en.wikipedia.org/wiki/Woodlouse#Classification)  Above photo by [mark faux](https://www.flickr.com/photos/69775178@N05/23102732371/) They have dark grey or black shells, with armour like exoskeletons made of 7 plates. Each plate has ~~2 pairs~~ one pair of legs attached, making 14 legs in total. They grow between 0.7mm to 18mm, and can live up to 2-3 years!  Above photo by [davholla2002](https://www.flickr.com/photos/14586608@N08/50936876047/) Their main defensive behaviour is to roll up into a ball, and they can also release an odourous chemical to deter predators. They will also 'ball up' in order to prevent dehydration, and moisture loss during dry periods!  Above photo by [Jim McLean](https://www.flickr.com/photos/jim-mclean/25048569252/) They are living fossils! Their aquatic ancestors lived in the oceans during the Silurian and Devonian periods. Later on, probably during the Carboniferous, they had evolved to live on land  Above photo by [Sam](https://www.flickr.com/photos/133414123@N05/26992433330/) During this aquatic to terrestrial transition they had to evolve a brood pouch (marsupium) to prevent their eggs and young from drying out (Their ancestors would have released eggs directly into the water).  Above photo by [Brian Valentine](https://www.flickr.com/photos/lordv/52608389220/) Another adaptation is breathing via their gills which are located on their hind legs and are always covered with a thin layer of water. As a result they have to live in moist, damp environments. They also prefer to live in groups!  Image [source](https://www.parasuniversal.com/2020/05/interesting-facts-about-woodlice-slaters-pill-bugs-rollie-pollies-roly-polies/) They eat decaying leaves, fungus, mold, and even the droppings of other animals. They help to break down vegetation and organic matter and play an important role in the nutrient cycle!  Above photo by [Siew Chuan Cheah](https://www.flickr.com/photos/cscvictor/51720973606/) They need to shed their exoskeleton as they grow, and this molt takes place in two stages. Firstly, the back half is lost, then about 2-3 days later, the front half sheds. Most other athropods shed their cuticles in one go  Above photo by [Max Thompson](https://www.flickr.com/photos/max-thompson/53358363887/) Woodlice can tolerate contaminated soil, unlike most other creatures! >....they can crystallise heavy metal ions midgut like copper, zinc, cadmium, arsenic and lead. This cleans up soil and purifies contaminated water. [source](https://www.parasuniversal.com/2020/05/interesting-facts-about-woodlice-slaters-pill-bugs-rollie-pollies-roly-polies/) Aren't they fab?  Above photo by [David Graham](https://www.flickr.com/photos/animal168/2775483587/) All information from [wikipedia](https://en.wikipedia.org/wiki/Woodlouse#) [here](https://factanimal.com/woodlouse/) and [here](https://a-z-animals.com/animals/woodlouse/#single-animal-text) unless stated otherwise As always, I'm not an expert, I just like sharing fun things....also this is my first post with my new mander account....woooo! edit- 'one pair of legs'
Title photo by [Robin Procter](https://www.flickr.com/photos/114775606@N07/51282050550/) It is one of the most common hawk moths in the UK and Europe It gets its name as the caterpillar is said to resemble an elephants trunk  Above photo by [Pete Hawkins](https://www.flickr.com/photos/52059383@N07/51413177453/) showing the brown variation of caterpillar It is one of the most colourful moths sharing the same colouration with the smaller Small Elephant Hawk Moth  Above photo of Large and Small Elephant Hawk Moths from [here](https://www.wildlifeinsight.com/british-moths/elephant-hawk-moth-and-caterpillar-deilephila-elpenor/) >It flies mainly in a single generation between June and September but with an occasional small second generation recorded in the south [source](https://www.wildlifeinsight.com/british-moths/elephant-hawk-moth-and-caterpillar-deilephila-elpenor/) >....active at dusk. It is commonly found in parks and gardens, as well as woodland edges, rough grassland and sand dunes [source](https://www.wildlifetrusts.org/wildlife-explorer/invertebrates/moths/elephant-hawk-moth)  Above photo by [Heath McDonald](https://www.flickr.com/photos/heathmcdonald/49927250192/) Its caterpillars feed on the leaves of willow-herbs, fuchsia and bedstraw. The adults are nocturnal feeders of flowers that open, or produce nectar at night. It can hover whilst feeding  Above photo by [Rolf Nagel](https://www.flickr.com/photos/99927961@N06/51238663638/) There is usually only a single generation in a year, although occasionally there may be small second generation recorded in the south The female moth release a sex pheromones in order to attract a mate  Above photo by [Richard Collier](https://www.flickr.com/photos/rmc1952/51332523173/)  Above photo by [Pablo Martinez-Darve Sanz ](https://www.flickr.com/photos/blezsp/52139288599/) After successfully mating the female lays eggs either singly, or in pairs on their preferred food plants (willow herb, bed straw, and some garden plants like fuchsias, dahlias, and lavender). The eggs hatch within 10 days  Above photo by [Wolfgang Burens](https://www.flickr.com/photos/wolfgangburens/36894423456/) The young caterpillars start off as yellowish white to green, then changing to a brown-gray colour with black dots along the length of the body when they have finished growing. There is often a green version of the full grown caterpillar. They reach approximately 3 inches long  Above photo by [Barry Forbes](https://www.flickr.com/photos/21651868@N07/2175146900/)  Above photo by [Nigel Pugh](https://www.flickr.com/photos/65365631@N04/6212538054/)  Above photo by [Beate](https://www.flickr.com/photos/santiago40/4862457965/) It takes about 27 days for the caterpillar to be ready to pupate. They find a secure spot usually at the base of a plant in debris, or underneath the ground. They then overwinter as a pupae!  Above photo by [Roger Wasley](https://www.flickr.com/photos/rogerwasley/8206139806/)  Above photo by [Richard Collier]()  Above photo by [David](https://www.flickr.com/photos/deschno/5793303499/) All information via [wikipedia](https://en.wikipedia.org/wiki/Deilephila_elpenor) unless otherwise stated
Title photo by [Mick Talbot](https://www.flickr.com/photos/micks-wildlife-macros/6842495966/) The Common Earwig belongs to the order Dermaptera, which is Greek for 'skin wings', The name 'Earwig' comes from the Old English words for 'Ear Beetle'. Entomologists believe the origins for the name refer to their wings, which look like an ear when unfolded. The species name 'auricularia' is a specific reference to this, and 'Forficula' comes from a Latin word for 'little shears' or 'scissors'. Despite their wings being fully developed, they are weak and rarely used, if they are found in the home on walls or on the ceiling they prefer to drop to the floor and scurry away  Above, photo by [Marc Kummel](https://www.flickr.com/photos/treebeard/41720454974/)  Above, Illustration of common earwig with wings extended. [Source](https://en.wikipedia.org/wiki/File:EB1911_Orthoptera_-_Common_Earwig.jpg) Earwigs don't purposefully climb into human ears, although there are anecdotal reports of the occasional earwig being found there. They certainly do not lay their eggs in human brains, and the old wives' tale is just superstitious nonsense  Above photo by [hedera.baltica](https://www.flickr.com/photos/hedera_baltica/48731799392/) The Common Earwig is found throughout Europe and Britain, it has also been introduced to North America, and accidentally to New Zealand. They prefer cool, moist habitats, and are mainly active at night. During the day they hide in inaccessible places like flowers, fruits, wood crevices  Above, photo by [Christian HUGUES](https://www.flickr.com/photos/146739550@N07/36438621054/in/pool-2705565@N24/) They are omnivores, but rarely hunt for prey, referring to scavenger instead. Their diets include plant matter (their favourites being Hedge Mustard, White Clover and Dahlias) and small insects including aphids, spiders, insect eggs They have elongated, flattened brownish coloured bodies, and are approximately 12-15mm long. Both sexes have forceps like cerci (forceps- paired appendages on the rear of many arthropods). The males cerci are large, robust and curved, whereas the females are slender and straighter. The cerci are used in courtship displays, as tactile stimulus for the females during mating, as well as for feeding and self defense.  Above, photo of male and female by [Tim Ransom](https://www.flickr.com/photos/23111015@N04/3329090430/) Both F. auricularia males and females take an active role during courtship. The males starts to display by bobbing or waving his cerci. If the female is receptive, both the male and female will progress to tactile stimulation, with the males using their cerci to encircle the female. It's worth noting that the males do not aggressively use their cerci to hold the female in place during mating.  Above, photo by [zosterops](https://www.flickr.com/photos/zosterops/51618698732/) Courtship continues with abdomen arching, bobbing and twisting, before mating occurs. Male cerci are necessary for mating, and those whose cerci were removed were unable to find a mate In order to mate the male and female face opposite directions, with the males cerci under the tip of the females abdomen. If undisturbed the mating pair can remain joined for many hours, with the female often moving around to feed. F. auricularia will look after both her eggs and provide additional care to her young and rarely feeds during this time. The female lays around 50 eggs in a small underground nest, 5mm below ground during Autumn. Entering a dormant state she stays with them throughout Winter. She cares for her eggs by cleaning them with her mouth and cerci, removing pathogens and fungi. She will defend her nest fiercely and relocate her eggs to a safer place if necessary  Above, photo by [Nikola Rahmé](https://www.flickr.com/photos/eurythyrea/13070772764/) In Spring the young hatch, and their mother continues to care and protect them. She will groom, provide food and even regulate the temperature of their nest. As they grow from larvae to first instar stage they are also taken by her on night time foraging excursions. She continues to guard them until they are around one month old and have reached maturity  Above, photo by [Thomas J Astle](https://www.flickr.com/photos/themagiccity/52596713937/)  [source](https://en.wikipedia.org/wiki/File:Earwig_life_cycle_2.svg) Common Earwigs also demonstrate altruistic behaviour by accepting foreign offspring and eggs and providing the same level of care as they do their own. It is not the case that they don't recognise the difference between their own and another's, as each mother regularly applies an aromatic chemical to her eggs and this chemical is family specific  Above, a molting earwig, by [Marcello Consolo](https://www.flickr.com/photos/marcelloconsolo/27236409542/) Both male and female Common Earwigs produce pheromones, which help them to find suitable group shelters to hide in during the day. These group shelters can be as many as 50-100 individuals per square meters which can encourage fungi, bacteria and also attract predators. It has been observed that having some feces in the nest site as it can have pathogen inhibiting properties, and feces eating can help with the transfer of gut bacteria and help if food is scarce  Above, photo by [Ireneusz Irass Walędzik](https://www.flickr.com/photos/irass/38312530536/) All information from [here](https://en.wikipedia.org/wiki/Forficula_auricularia), [here](https://en.wikipedia.org/wiki/Earwig#In_literature_and_folklore) and [here](https://a-z-animals.com/animals/earwig/) As always my disclaimer- I am not an expert, I just like finding and sharing interesting things. Any errors please leave a comment and I'll edit my post. Cheers!
cross-posted from: https://lemmy.ml/post/12435180 **NB This is a post I did on awwnverts and decided to add it here. I've included some extra photos of ol' Eunice, as I wanted to show how beautifully iridescent it is, as well as some really nice (glamorous) head shots!** > Post image 'Bobbit-Worm' by [Hendra Tan](https://www.flickr.com/photos/hendradive/452634852/) > > Their name comes from the [John and Lorena Bobbit Case](https://en.wikipedia.org/wiki/Eunice_aphroditois) > > They live tropical and subtropic bodies of water in the Indo-Pacific. They've been discovered in Bali, New Guinea, the Philippines, Australia, Fiji, and Indonesia! > > They can reproduce asexually via segmentation!  Photo by [budak](https://www.flickr.com/photos/budak/50937611626/) > They can live between 3-5 years and grow on average 3 feet long, although one was discovered at 10 feet long! > >  > > Photo by [Ken Traub](https://www.flickr.com/photos/diverken/496123080/) > > > The fossil record shows they've been around for 20 million years! > > They like to build mucus lined burrows on the sea floor from where they ambush their prey! > > >  > > Photo by [eunice khoo](https://www.flickr.com/photos/mermate/9199992410/) > > Despite having a pair of small eyes they use their antennae to detect prey as they are virtually blind!  Photo by [Ken Traub](https://www.flickr.com/photos/diverken/379372556/) > Peters' Monocle Bream tropical fish have been observed 'mobbing' Bobbit Worms by directing sharp jets of water at them in order to deter their attacks! > > Bobbit Worms can decimate aquariums. They can arrive as small worms hidden in rocks and corals and can remain undetected for quite some time. Don Arndts [heroic battle](https://www.michiganreefers.com/threads/the-bobbit-worm-chronicles.84173/) against a Bobbit Worm is the stuff of legends. His foe was a wily adversary despite the many attempts to poison and kill it, including glue and crushed glass hidden in baited shrimp! [TLDR version here](https://whyy.org/segments/liz-bobbit-worm/) > > Their jaws are wider than their bodies are retractable and open like scissors!  Photo by [Anilao~Critters](https://www.flickr.com/photos/74171608@N04/16445181732/) > Their bodies are covered in tiny bristles which grip, and help it to explode out of it's burrow while hunting! Mr DeMille, I'm ready for my close up...  Photo by [Rob_Lee Photography](https://www.flickr.com/photos/rob_lee/26225835836/) >  > > Now give the little fella a kiss! > > (photo by [Pauline Walsh Jacobsen](https://www.flickr.com/photos/coralreefdreams/40686688393/)) > > > > edit- most info from [here](https://www.treehugger.com/bobbit-worm-facts-5115409) and I forgot to credit the last image
Title photo 'Cuthona yamasui, Tulamben,bali,indonesia' by [Yansu JunK](https://www.flickr.com/photos/yansudiverbali/31400131574/in/photolist-2k6f1ef-7m3tTJ-PQHT9S-mimuLD-B78R5B-2oTUZdM-2oTU4xC-2hwraHo-SjmnGR-pjfK24-2p3vXc6-2p5T9jS-mwzQ6D-7E12Zf-rxwfJ5-84B6ZJ-2p3uC4V-riWkFR-KVwdgG-dFTNwk-gLupo9-9c8QC6-qBnUqg-rxsJsi-mDhfS-nDghLf-qBgNt9-2p5T9jG-2p3wZyt-CLJMQ-2p3u94K-8mAqKQ-75Pk12-DyTPg8-8ozWFN-8kJzJs-8mAv1h-8orM8z-qCjdBb-nDgr2o-h5oHm6-h5oZvQ-h5q1Fn-h5LVWc-h5oJ8B-h5b797-7NMUbE-L6KRhe-D7FN9-4N6qFZ) Nudibranch, meaning 'naked gills' are an order of marine gastropod of over 3000 species! They breathe through a ‘naked gill’ shaped into branchial plumes (simillar to the alveoli of a human lung) but external to their bodies  Above, 'Ocellated Phyllidia, Phyllidia ocellata, Alor, Indonesia' by [Jeremy Smith](https://www.flickr.com/photos/jeremysmithphotos/37588125192/) They are soft bodied, slug like creatures and are noted for their bright colours and extravagant body forms. Their nicknames reflect their fabulous forms- "clown", "marigold", "splendid", "dancer", "dragon", and "sea rabbit"  Above, 'Flabellina affinis' The Mediterranean by [Verheyen Stefan](https://www.flickr.com/photos/139801191@N08/49588376903/in/photolist-2kDqrBn-2bc22mB-2kcCoPj-2nwqANN-2ixXoPz-24X6q4X-TeoLzj-29dnQfQ-rcesHF-2kRCGY6-2hukipx-25ZV2gW-oNfUJF-6Vgito-2ogCzRU-2hX9QxV-agJd9H-23JQeaS-2nGzd8V-3m3UR-2mFpYLN-2dQ3Mti-S4TbZ2-cBJaJW-2jQ2246-GoU4si-2ijfiys-X5rwRu-btKPtK-75zakF-7HvqTP-995iCY-6CoBWb-6VcqGB-2gG9uno-6RAe7J-995iPA-2dZqqLY-2gQPHmT-6J8i9E-2jkpnDr-2jkskKD-SCfEjd-9XuTn3-2hi8Hc3-9b1AGP-2mLme8d-6VgrYJ-oN5fdh-Yy551C) They are found worldwide including the Arctic and Antarctic, through temperate to Tropical sea waters (though some species can live in brackish waters) They can be found at all water depths from warm shallow reefs (where the greatest number of species are found) to depths of 700 metres. One species was discovered at a depth of 2500 metres!  Above, 'Nembrotha kubaryana). Lembeh, Indonesia' by [Trent Burkholder](https://www.flickr.com/photos/deco4macro/712736369/) Species can vary in size from 4mm to 40cm long, and are oblong in shape. They can also be thick or flattened, long or short, ornately colored or drab to match their surroundings!  Above, 'Hermissenda crassicornis, Point Defiance Marina, Tacoma' by [Zachary Hawn](https://www.flickr.com/photos/zhawn8306/29049151297/) Their eyes are small and simple, and can only discern differences in light and dark. Instead they have tentacles on their heads which act as sensory organs being sensitive to touch, taste and smell!  Above, 'Ceratosoma trilobatum, Indonesia, South Molucces - Ambon' by [divemecressi](https://www.flickr.com/photos/berndhoppe/32078462811/in/photolist-2nuovr2-YdoP8u-95o8pq-MwwzwV-9TXntV-2owRjTe-dK2CFR-QSEvp2-2inpHJn-ecoV78-ajMwkC-qzLT1N-CgHdWA-ej9ZM5-25FV9TA-2hwueBs-GAe5WK-nmGQDa-ejFREA-nWJCmJ-2mfmtSe-LNVaBp-2j6b2jM-n7dz9a-GHTudk-cNnaZo-qKtqNf-2k1Ptmb-LsDV6t-9y1dM4-2i2UaYP-nEnXfD-dWkDj2-er4e1b-AiL1u-2pgGC8P-ogwaJ1-8a8Tna-ELFeE-2hpzCvY-iiLhu-CMCYqB-CpZhW7-2j27eDi-96uMLr-k2kmg-4hrTLG-Db247d-6CrKZV) They are carnivorous predators, usually feeding on sea sponges, anemones, corals and barnacles, although some are cannibalistic! They have evolved defense strategies to protect them from being eaten, including camouflage to look like sea sponges, chemical defenses complete with warnings. Some species eat hydrozoids (a relation of jellyfish) and then store the stinging cells that pass undigested through their gut to their rear end...any predator trying to bite one of these nudibranchs will end up with a painful sting!  Above, 'Phideana hiltoni' by [Ken Bondy](https://www.flickr.com/photos/kenbondy/2159183478/in/pool-nudibranchsandseaslugscois/) They are hermaphrodites (both male and female) and their sex organs are on the right side of their bodies. They still need to reproduce sexually though. When they meet a suitable partner they will engaged in a 'courtship dance' lasting for a few minutes. They then lay eggs in a long slimy ribbon, from as few as a couple to up to *25 million!* [source](https://en.wikipedia.org/wiki/Aplysia_fasciata)  Above, 'Consummation' by [lee Ming](https://www.flickr.com/photos/womaninawetsuit/2281498826/in/pool-nudibranchsandseaslugscois/)  Above, 'Threesome having fun, Lamprohaminoea cymbalum, Tulamben Bali' by [Ludovic](https://www.flickr.com/photos/luko/53493280753/in/pool-nudibranchsandseaslugscois/) More nudibranchs to enjoy.....  Above photo by [Jackson Wong](https://www.flickr.com/photos/theoceanstone/2510715337/in/pool-nudibranchsandseaslugscois/)  Above, 'Halgerda tessellata, Philippines - Malapascua' by [divemecressi](https://www.flickr.com/photos/berndhoppe/33964879288/)  Above photo by [Carol Buchanan](https://kids.nationalgeographic.com/animals/invertebrates/facts/nudibranch)  Above photo by [Barbara Stevens](https://www.nationalgeographic.com/animals/invertebrates/facts/nudibranchs-1)  Above photo by [Joan Ribas](https://www.nationalgeographic.com/animals/invertebrates/facts/nudibranchs-1) All info from [here](https://en.wikipedia.org/wiki/Nudibranch#Life_cycle), [here](https://biologydictionary.net/nudibranch/) and [here](https://www.nationalgeographic.com/animals/invertebrates/facts/nudibranchs-1) As always, I'm not an expert I just like sharing fun things....any errors leave a comment, and I'll edit my post, cheers! edit, link
Title photo- life reconstruction of [Aysheaia pedunculata](https://en.wikipedia.org/wiki/Aysheaia) Travel back in time to the Cambrian Era, a period famous for the diversity of its life forms! Lasting approximately 53.4 million years from the end of the preceding Ediacaran period 538.8 million years ago (mya) to the beginning of the Ordovician period 485.4 mya. It is a period where the atmosphere had elevated concentrations of oxygen, and the global temperature increased-creating a temperate world  Geological timescale from [here](https://www.sutori.com/en/story/geologic-time-scale--gaP3hEy5bkbZhpxTgfZSgREZ) Scientists believe that the higher oxygen levels, and warmer climate contributed to the incredible diversity of life that occurred in the oceans. However, on land it was mostly barren...complex lifeforms were non-existant and would have been restricted to mollusks and athropods emerging from the water to feed on micobes in slimy biofilms The Cambrian is unique as it had unusually high deposits of lagerstätte sedimentary deposits, these sites offer exceptional preservation of 'soft' organism parts, as well as their harder shells which means that the study and understanding of the fossilized life forms surpasses some of later periods Which brings us to Aysheaia! >It is an extinct genus of soft-bodied lobopodian, known from the Middle Cambrian Burgess Shale of British Columbia, Canada [source](https://en.wikipedia.org/wiki/Aysheaia#) Described as looking like a 'bloated caterpillar' with spines. It was a segmented worm like animal 1 to 6 cm in length and about 5 mm wide Comprised of 10 body segments with each segment having a pair of spiked annulate legs (consisting of rings or ringlike segments). It did not have a separate head, its mouth occupied the front of the body along with 6 finger like projections, and 2 grasping limbs on it's 'head'.  Diagrammatic reconstruction of Aysheaia pedunculata  Reconstruction of A. pedunculata It was similar to modern terrestrial Onychophora (velvet worms). However, it differs due to a lack of jaws and antennae, and possible lack of visual organs, and the terminal mouth...  Above, Photo of Velvet Worm (Euperipatoides sp.) by [Stephen Zozaya](https://www.flickr.com/photos/euprepiosaur/5049948235/) Aysheaia is believed to have grazed on prehistoric sponges gripping onto them with it's many claws. The shape of it's mouth suggests that it was a predator. It probably used the paired structures on it's head to grasp hold of its prey, and then pass it to the finger like projections around its mouth And now for some fossils!  Above, Lobopodian Aysheaia pedunculata Walcott, 1911, USNM 365608 from the Stephen Formation (Cambrian Series 3, Stage 5), British Columbia, Canada [here](https://en.wikipedia.org/wiki/File:Aysheaia_pedunculata_USNM_365608.png)  Above, Aysheaia pedunculata (ROM 61108). Complete specimen preserved laterally showing limbs and gut trace. Specimen length = 20 mm [here](https://burgess-shale.rom.on.ca/fossils/aysheaia-pedunculata/)  Above, Aysheaia, a worm-like animal with annulated legs, from the Burgess Shale, Canada [here](https://wp.unil.ch/paleo/page-exemple/exceptional-preservation/) Also this really awesome diorama of life under the Cambrian sea  Above, Burgess Shale Biota (L-R) Aysheaia, annelid worms, Olenoides trilobite, Marrella [here](https://www.flickriver.com/photos/jsjgeology/32497972133/) Well I hope you enjoyed this post (hopefully the first of many) of ancient invertebrates, and as usual my disclaimer that I'm not an expert, I just like sharing fun things! All information via wikipedia [here](https://en.wikipedia.org/wiki/Aysheaia#) and [here](https://en.wikipedia.org/wiki/Cambrian), and not wikipedia from [here](https://en.wikipedia.org/wiki/Cambrian) and [here](https://www.thoughtco.com/strangest-animals-of-the-cambrian-period-4125717) edit, formatting
Title photo by [Kristen Rudd](https://www.flickr.com/photos/kristenrudd/413711911/) There are over 7000 species of worm, of which 150 are widely distributed around the world! Their bodies are made of many ridged segments covered in tiny bristle called 'setae', which help them grip the substrate allowing them to move forwards and backwards!  Photo by [John Hallmén](https://www.flickr.com/photos/johnhallmen/12948634595/) They eat organic plant matter, fungi and other microorganisms! Earth worms breathe through their skin, can breathe underwater and survive being submerged for quite some time! They secrete mucus which helps them move through the soil and by contracting and relaxing different muscles, which alternates shortening and lengthening their bodies!  Photo by [Aisling](https://www.flickr.com/photos/tinkerbell54/4149253675/) Earthworms are mostly hermaphrodites (having both male and female sex organs), although recently a (nematode) [worm was discovered](https://www.sciencealert.com/a-worm-with-three-sexes-and-a-tolerance-for-arsenic-found-thriving-in-a-nearly-lifeless-lake) that had 3 sexes, 1 part male, 1 part female, and 1 part hermaphrodite (it also lives in water 4 times saltier than the ocean and is immune to arsenic!) One [study](https://www.researchgate.net/publication/229868922_The_mating_behaviour_of_the_earthworm_Lumbricus_terrestris_Oligochaeta_Lumbricidae) found that worm sex can last between 69-200 minutes! Both worms will get pregnant during sex, and each worm will use both their sex organs at the same time!  Photo by [Reds.](https://www.flickr.com/photos/reds42/2825769486/)  Photo by [Bob](https://www.flickr.com/photos/54629463@N05/53415362515/in/photostream/) >Post exchange, each worm forms a collar-like clitellum around its body. This clitellum, filled with eggs and sperm, forms a cocoon when it’s pulled off. Inside the cocoon, fertilization occurs, resulting in hatchlings. via [Bob](https://www.flickr.com/photos/54629463@N05/53415362515/in/photostream/) Each earthworm can produce up to 1000 baby worms every 6 months! They are also capable of parthenogenesis, where they can reproduce asexually without the need for fertilisation Earthworms will swallow tiny stones which they keep in their gizzard, these grind up vegetation and other organic matter to help digestion! They have a closed circulatory system (like humans) which has 5 pairs of aortic arches which work together like 10 hearts to circulate blood- pushing it in one direction, then pulling in the other. (Most invertebrates have a simple pumping of fluids around an open system, which washes inside the body with blood extracting and exchanging nutrients and waste)  Earthworm Dissection by [threeflowersphotography](https://www.flickr.com/photos/slroggemann/4344184748/) Earthworms are Soil Engineers, their burrowing mixes soil, aerates substrate and converts complex organic matter into earthworm poo, which is then used by plants. They are critical to our growth of food and trees, without them soil density would increase, reducing the ability of roots to take up water and breathe!  Photo by [John Glover](https://www.flickr.com/photos/earthworms/7999161085/) Earthworms have also been observed exhibiting social behaviour by forming herds and making 'group decisions' by using touch to influence each other! >....[They] tested how the worms affected each other's behaviour, investigating whether the worms use either chemical signals or touch to decide which chamber to move to....[Results] indicated that the worms did not leave a chemical trail behind them that communicated their direction of travel.... ......suggesting that they used touch to communicate where they were going. [Source](http://news.bbc.co.uk/earth/hi/earth_news/newsid_8604000/8604584.stm) Now give our worm friend a kiss!  Photo by [Dave Buckley](https://www.flickr.com/photos/42737338@N02/15488519207/) All info from [here](https://factanimal.com/earthworm/#easy-footnote-bottom-3-4058) and [here](https://thewormpeople.com/earthworm-data/how-do-worms-reproduce/), unless otherwise stated Disclaimer! I'm not an expert, I just like learning and sharing fun things...any mistakes, leave a comment and I'll edit, Cheers! edit, added (nematode) for clarification
No fun facts from me, but i like how when i tried to pick it up with a stick, it tilt its back toward the stick to protect its belly. Interesting creature!
Title photo by [LS Perks](https://www.flickr.com/photos/188714846@N04/49996995207/) Native to Australia (where else?) it can also be found as an invasive species in New Zealand. It feeds on Eucalyptus species and can become problematic, striping the leaves and damaging the trees hence it's actual name The Gum Leaf Skeletoniser As the caterpillar grows it sheds it's exoskeleton, during each molt the head portion of the previous exoskeleton stays attached to it's body resulting in a mini tower of empty heads “The molted head capsules start stacking early but they are not always visible, as the smaller ones get dislodged over time,” Hochuli said. “It’s not uncommon to see caterpillars with at least five old heads stacked on top of the one they are currently using.” [Source](https://edition.cnn.com/2020/08/09/world/uraba-lugens-caterpillar-heads-scn/index.html) The heads can reach up to 12mm tall, and look rather dandy!  Photo by [Alan Henderson/Minibeast Wildlife](https://edition.cnn.com/2020/08/09/world/uraba-lugens-caterpillar-heads-scn/index.html) The several reasons for this, one is to look bigger and more intimidating to predators, another is to create a false target for a predator, and another is that the caterpillar uses the head piece as a weapon or shield to fend off insects with needle like mouth parts such as Assassin Bugs >....researchers removed the head stacks from some caterpillars, left them on others, and kept tabs on their survival once they were back in the field. Caterpillars who kept their extra heads were much more likely to survive in the field....[Source](https://edition.cnn.com/2020/08/09/world/uraba-lugens-caterpillar-heads-scn/index.html)  Photo by [John Tann](https://www.flickr.com/photos/31031835@N08/6714809993/) Unfortunately for The Mad Hatterpillar it's list of predators is long and relentless.... it has also evolved stinging hairs to complement it's head gear, and will writhe around to evade being grabbed, and if that isn't enough it will vomit out it's guts.... >“They’ll just spew out a whole bit of yucky green liquid that probably smells and tastes awful,” Henderson said. “And if they shove that in the face of the predator, it can turn them off.” [Source](https://edition.cnn.com/2020/08/09/world/uraba-lugens-caterpillar-heads-scn/index.html)  Photo by [Betty AN](https://www.flickr.com/photos/betty_an/5148150574/) Once the Mad Hatterpillar is finished eating all the Eucalyptus it can, it pupates into a small brown, unremarkable moth with markings that help it camouflage on the trunks of it's food source  Photo by [Victor Fazio](https://www.flickr.com/photos/victor_fazio-iii/41789611652/)
Title photo by [Thomas J Astle](https://www.flickr.com/photos/themagiccity/42939903105/) (Possibly Zoosphaerium neptunus, Madagascar) Giant Pill Millipedes (Sphaerotheriida) are found in Southern Africa, Madagascar, South and Southeast Asia, Australia and New Zealand. They like moist habitats in leaf litter on forest floors They can roll into a ball if disturbed, smaller ones can be the size of a cherry, slightly larger ones can be golf ball. The largest which come from Madagasgar can be the size of an orange! .....crunchy on the outside with a soft chewy centre....  Borneo Giant Millipede, Photo by [Tristan Savatier](https://www.flickr.com/photos/loupiote/6683432519/)  Sabah, Borneo, Photo by [Thomas J Astle](https://www.flickr.com/photos/themagiccity/19564466316/)  Possibly Zoosphaerium neptunus, Madagascar. Photo by [Thomas J Astle](https://www.flickr.com/photos/themagiccity/43794924862/in/photostream/) The Giant Millipedes first and last dorsal plate align perfectly with no gap, making a tightly sealed ball which most predators can't open, however there are some including snails in South Africa which specialise in feeding on them. Also Meerkats and birds will hunt and eat them! They are ground dwelling detritivores, and feed on dead organic matter, such as leaves and wood on the forest floor. They play an important role in decomposition helping to break down organic matter back into the soil! A few Giant Millipedes can produce sound! >Sphaeromimus pill-millipedes live in the rainforests of southeastern Madagascar.....Males have a structure on their anterior telopod, known as the harp, which has several ribs and is able to produce sounds. This stridulation organ is still not well understood, but may play a role during courtship. [Source](https://www.sci.news/biology/science-chirping-giant-pill-millipedes-madagascar-02012.html) The name for them in the local language [in Madagasgar] is 'tainkintana' which means 'star droppings'! Their antennae are very dexterous and mobile, and resemble elephant trunks as they probe their environment! [checkout this video!](https://youtu.be/ZWg71eEcvVg?t=3)  Sabah, Borneo, photo by [Thomas J Astle](https://www.flickr.com/photos/themagiccity/19583704342/) Their sex lives have 4 different phases.... >The first phase is when a male detects a female, and orientates itself by positioning its anal shield towards the potential partner. Second, once the male is in contact with the female it starts to make stridulation sounds and vibrations. If the female recognises the male and is receptive, she will open up from her rolled-up position, or not roll up, and the male will then move below the female and grab her front legs with his telopods > >The male then ejects sperm from his penises (he has one small penis at the base of each of the first pair of legs on the second segment), and transfers the sperm backwards along his legs and into the female opening which is on her second pair of legs. The two millipedes will then separate. After that, the female lays her eggs in the soil and covers them with a mud layer for protection. The eggs hatch into very small, pale pill-millipedes. [Source](https://www.sanbi.org/animal-of-the-week/giant-pill-millipede/) They are slow movers and are able to burrow into the soil and leaf litter. They also come in a nice variety of colours and patterning!  Photo by [KancheongSpider](https://www.flickr.com/photos/joannayeoml/21098073361/)  Photo by [Mok Youn Fai](https://www.flickr.com/photos/128070920@N03/35604950176/)  Agumbe Rainforest Research Station, Karnataka, India, photo by [cowyeow](https://www.flickr.com/photos/cowyeow/24821083951/)  Possibly Zoosphaerium neptunus), Madagascar, photo by [Thomas J Astle](https://www.flickr.com/photos/themagiccity/43794906712/in/photostream/)  Bothrobelum rugosum, Bau, Sarawak, Malaysia, Photo by [bob5](https://www.projectnoah.org/spottings/905525123) Adult females have 21 leg pairs (42 in total), while males have an additional 2 leg pairs, which are probably used to grasp onto the females during mating!  Zoosphaerium neptunus, photo by [Nicky Bay](https://www.flickr.com/photos/nickadel/42547365360/) .....draw me like one of your French girls.......  Zephroniidae, photo by [Nicky Bay](https://www.flickr.com/photos/nickadel/9341276695/)  Sphaerotheriida, Karnataka, India, photo by [vipin.baliga](https://www.projectnoah.org/spottings/16118614) All info via [wikipedia](https://en.wikipedia.org/wiki/Sphaerotheriida) and [Scientific American](https://www.scientificamerican.com/blog/artful-amoeba/seven-new-species-of-pill-millipede-found-in-madagascar/) unless otherwise stated Also I'm not an expert, I just like sharing fun things and critters, any errors let me know in the comments and I'll edit my post, cheers