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oh how NEAT! A #deepsea "squid worm" member of the Acrocirridae, Teuthidodrilus apparently feeding? on remains of a sea cucumber! #wormwednesday youtu.be/wxIAb_neJ30?...

youtu.be

Flamboyant Squidworm Feasts on Sea Cucumber

YouTube video by EVNautilus

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Cormac MacFhionnlaoich @cormacscoast.bsky.social · 12h

Watching the waves rolling in against a spectacular piece of the North Antrim coastline. County Antrim, Ireland. Cormacscoast.com

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Rebecca R Helm @rebeccarhelm.bsky.social · 30/09/2026

Magical creatures don’t exist, eh? Roughly 400 million years ago, before the birth of trees, there were giant mystery cones called “Prototaxites,” which grew nearly 30 feet tall. We literally have no idea what they were. Plant: no Mushroom: no Animal: no Tell me this isn’t a little bit magic

Sunset with giant mystery cones Prototaxites https://www.ibtimes.co.uk/prototaxites-fossil-explained-why-this-prehistoric-colossus-still-baffles-scientists-1773173

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Elizabeth Beston @elizabethbeston.bsky.social · 12h

Lots of tintinnids in my samples at the moment. #marineplankton 🦑🔬

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DASSH @dassh-at-the-mba.bsky.social · 20h

👀 iNaturalist Observation of the Month 📷 This stunning pink coryphella (Edmundsella pedata) was spotted off Plymouth by Brenton Prigge. Its vibrant pink and purple cerata make it one of the UK's most eye-catching nudibranchs. Share your sightings 👉 uk.inaturalist.org @thembauk.bsky.social

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Chris Mah @echinoblog.bsky.social · 28/09/2026

Two further slit shells, Pleurotamariids from Puerto Rico, 283m or thereabouts, Vieques Island seen by #Okeanos in 2018 during the Oceando Profundo expedition #molluscmonday

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Chris Mah @echinoblog.bsky.social · 28/09/2026

A pleurotamariid "slit shell" snail at 262 m from Pichincho Wall East, Puerto Rico during the 2018 #Okeanos Oceando Profundo expedition EX1811 #mollucmonday

brown-orange shell sitting on a deepsea cliff face

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Nicola Crockford @numenini.bsky.social · 27/09/2026

I like this pic of a Common Bithynia (Bithynia tentaculata) at the end of the rainbow. With more River Nerites (Theodoxus fluviatilis) & their eggs, Acute Bladder Snail (Physella acuta), plus Common River-Snail (Viviparus viviparus) & chomping Great Ram's-Horn (Planorbarius corneus). #MolluscMonday

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Paul D. Taylor @nhmbryozoa.bsky.social · 28/09/2026

#MolluscMonday Section of a fossil gastropod shell in a Bordeaux street paving stone. I believe this to be an acteonellid of Cretaceous age but would welcome feedback.

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Anthony (Tony) J. Martin @ichnologist.bsky.social · 28/09/2026

Terrific example of #scicomm for my #ENVSCOMM26 students to watch & learn, about the Billion Oyster Project in NYC, which aims to replenish oyster reef there for all of the good reason. Also thematically apt for #MolluscMonday! 🧪🦪

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Íñigo Vitón @vitoninigo.bsky.social · 28/09/2026

🇬🇧🐚 #MolluscMonday at Robin Hood's Bay (Yorkshire) section, the Pliensbachian GSSP #Jurassic #ammonites [See ALT for captions]

Bifericeras donovani. Lowermost Pliensbachian

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Emil @bergylta.bsky.social · 28/09/2026

Another week and another #molluscmonday. This time we got the Facelina bostonensis nudibranch, which i saw on a scuba dive on a cold november day. It is also known as "Dragon nudibranch" in Swedish. 🤿🦑 Taken 2023-11-11 in Jordfalls Hamn camera: Olympus TG-5

A photo of a beige-pink Facelina bostonensis nudibranch. The nudibranch has white tips of its cerata (pointy bits on its back). It is crawling on a stalk of algae, laying a string of white eggs.

A photo of a beige-pink Facelina bostonensis nudibranch. The nudibranch has white tips of its cerata (pointy bits on its back). It is crawling on a light-brown substratum

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Veeloxxy Bites @the-episiarch.bsky.social · 25/09/2026

Termitodesmidae is an elusive family of millipede that lives exclusively in the fungal chamber of termite nests where they get to chow down on an all-you-can-eat fungal buffet 🧪 link.springer.com/article/10.1...

Ceylondesmus kistneri in the fungal chamber of a termite mound.

Dorsal (top) and ventral (bottom) view of Ceylondesmus escherichi

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Duncan McIlroy @dmcediacaran.bsky.social · 26/09/2026

We names the #Ediacaran #Edrathina obditchia from #InnerMeadow after we had decided it was a stem ctenophore. Ctenophores are also known as comb-jellies. Following recent convention we have used Beothuk words for naming. Edrathin means comb & Obditch means beast. So the name means “comb beast”

view looking into the triangular/collapsed cone calyx of Edrathina with the tentacles oriented towards you and the holdfast disc found at the top right. the tentacles have numerous pinnules arising from them and can be seen to arise from the margin of the calyx.

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Cephalopods Daily @cephalopodsdaily.bsky.social · 25/09/2026

🦑📷Schmidt Ocean, Schmidt Ocean, NOAA Ocean Exploration, Schmidt Ocean

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Cephalopods Daily @cephalopodsdaily.bsky.social · 25/09/2026

Joubin's squid (Joubiniteuthis portieri) is a funky, little squid that looks like one of those head massagers. It has a max mantle length of 9 cm and a long tail which is thought to mimic sinophores. They are also the closest relatives to the even more lanky bigfin squids (Magnapinna) #SQUIDtember

Joubin's Squid (Joubiniteuthis portieri) floating in the ocean. The squid is very thin and has a orange colour. It has a long tail extending from its mantle and is waving in the water. Its arms are long and thin, and are extending out and curling back in. The arms are a slightly orange off white.

Joubin's Squid (Joubiniteuthis portieri) floating in the ocean, with the camera centred on its head. It has black beady eyes. Its arms are long and thin, and are extending out and curling back in. The arms are a slightly orange off white. Its body is thin and is orange. Its tail is outside of the frame.

Joubin's Squid (Joubiniteuthis portieri) floating in the ocean. The squid is very thin. Its mantle is off white and the rest of it is reddish orange. It has a long tail extending from its mantle and is waving in the water. Its arms are long and thin, and are loosely spread out.

A close up of a Joubin's Squid (Joubiniteuthis portieri) floating in the ocean and reacting to the ROV. It has black beady eyes. It has long, thin arms that are mostly white but they have orange chromatophores on them. The chromatophores are more visible near its head. Its orange body is quite thin. Its head is in the ROV's shadow.

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Lincoln Shoemaker @lincoln-shoemaker.bsky.social · 16/01/2025

This was perhaps one of my top 5 favorite finds of all time. A beautiful Taxocrinus ungula from the Edwardsville formation of Indiana. From the field to finished. This piece also had a nice Halysiocrinus tunicatus hitchhiking. #Fossil #crinoid #echinoderm #paleontology #paleozoic #geology

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Chris Mah @echinoblog.bsky.social · 02/07/2026

Was sorting a bucket from the tropical Pacific and found this! An aberrant stalked crinoid columnal! from a LIVING species! Not that unusual but very similar in appearance to Paleozoic roadcut fossils! ha ha. #echinoday

pentagonal shaped petal pattern each with radiating patterns. White on yellow background

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Lincoln Shoemaker @lincoln-shoemaker.bsky.social · 26/11/2024

So the cool thing about this platform being relatively new is that I get to be THE crinoid guy. Here's a cool Eretmocrinus - Dorycrinus association I found from the Edwardsville formation of Montgomery County Indiana last year. #Fossil #echinoderm #paleontology #paleozoic

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Lincoln Shoemaker @lincoln-shoemaker.bsky.social · 05/12/2024

Zeacrinites is a common upper Mississippian crinoid but beautiful all the same. This one comes from the Glen Dean Formation of Grayson County, KY. #Fossil #Crinoid #paleontology #paleozoic #carboniferous #Mississippian #echinoderm

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Lincoln Shoemaker @lincoln-shoemaker.bsky.social · 04/12/2024

A diminutive crinoid, Lanecrinus (formerly Decadocrinus) depressus from the Edwardsville formation of Monroe County Indiana. This is one of the more common Edwardsville crinoids, but common or not they are always fun to find. #Fossil #Crinoid #paleozoic #carboniferous #paleontology #echinoderm

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Chris Mah @echinoblog.bsky.social · 12/07/2025

In the Paleozoic there were snails, Platyceras, that would affix themselves over the anal vents of stalked crinoids! They were allegedly implacable! Ha ha..but then, in the Paleozoic that would have pre-dated Satan! (a human creation) #echinoday

cartoon with a snail tightly fixed on the anus/mouth of a crinoid with Satan trying to dislodge it

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Dr. Davey F. Wright ⛏️🦕🧬 @daveyfwright.bsky.social · 16/05/2025

The Sam Noble Oklahoma Museum of Natural History has an absolutely spectacular collection of fossil crinoids, including these beautiful late Paleozoic eucladids #FossilFriday🧪

A beautiful specimen of the calyx and arms of the fossil crinoid Agalocrinus oklahomensis (OU 7337)

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Lincoln Shoemaker @lincoln-shoemaker.bsky.social · 28/11/2024

Another neat crinoid I found and finally finished the prep on. Lebetocrinus sp. from the Edwardsville formation of Monroe County, Indiana. #Fossil #crinoid #paleontology #paleozoic

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Lincoln Shoemaker @lincoln-shoemaker.bsky.social · 28/11/2024

Another crinoid, this time a Scytalocrinus from the Edwardsville formation of Monroe County, Indiana: #Fossil #Crinoid #paleontology #paleozoic #echinoderm

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James Witts @jdwitts.bsky.social · 27/07/2026

I started a new part-time role @nhm-london.bsky.social today providing curatorial cover in the Fossil Echinoderm collection. Job #1 was putting away some specimens which were scanned by a visiting researcher, giving me a chance to see some of these amazing Paleozoic #crinoids (sea lilies)!

A slab of grey rock covered in fossil crinoids.

A weird holdfast for a Paleozoic crinoid

A small piece of the Paleozoic sea floor preserved in rock, with a fossil crinoid, snail, and trilobite

A beautifully preserved articulated Paleozoic crinoid showing the arms and stem.

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Dave Rodland @daverodland.bsky.social · 07/03/2025

Welp. Must be #FossilFriday 🧪⚒️ It's the start of Spring Break, so this one's on the smaller side: an articulated crinoid fossil I picked up at a local rock show years ago, identified as Dichocrinus multiplex. Our collection is light on good crinoid specimens, so it often found its way into labs.

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David Clark @clarkeocrinus.bsky.social · 19/06/2026

A stunning Physetocrinus copei crinoid calyx from the Mississippian Lake Valley Formation of New Mexico. I love the detailed ornamentation on this one. You can see where the stem and arms would have been attached. #FossilFriday

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David Clark @clarkeocrinus.bsky.social · 17/01/2026

Jimbacrinus is a really strange, alien looking crinoid. Permian aged crinoids are uncommon. These are from Australia. Keep creating and sharing your art. #FossilFriday #SciArt

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David Clark @clarkeocrinus.bsky.social · 12/06/2026

Before and after pictures of a Cupulocrinus latibrachiatus crinoid for the late Ordovician Vaureal Fm. of Quebec. This specimen has always surprised me because the stem looks too small to support the large calyx and arms. #FossilFriday

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Geology Johnson @geologyjohnson.bsky.social · 21/02/2025

One for the echino-nerds this #FossilFriday This nice ~10 cm #crinoid stem from the lower #jurassic Cleveland Ironstone, N Yorkshire, UK. #geology #paleontology

Wet grey mudstone with a long crinoid fossil exposed on the surface. The crinoid is made of light grey star shaped segments connected in a long column.

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Charmouth Heritage Coast Centre @charmouthhcc.bsky.social · 05/09/2025

Well the weather's been a bit wetter this week which has meant the beaches have been a bit quieter! Perfect chance to look for a few bits like our volunteer Jake has done! A beautiful chunk of crinoid found earlier in the week! #FossilFriday

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Paul D. Taylor @nhmbryozoa.bsky.social · 19/06/2026

#FossilFriday The iconic Triassic crinoid Encrinus liliformis. This example from Braunschweig, Germany is on display in the Palaeontological Museum in Oslo.

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Paul D. Taylor @nhmbryozoa.bsky.social · 09/05/2025

#FossilFriday Crinoid Traumatocrinus from the Late Triassic of SW China.

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Henning @geohenning.bsky.social · 11/10/2024

It's #FossilFriday, so here's a star-shaped crinoid columnal. #Fossils ⚒️🧪

A star shaped crinoid columnal on my fingertip.

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David Clark @clarkeocrinus.bsky.social · 21/11/2025

Platycrinites bozmanensis crinoid from the remote Mississippian Lodgepole Fm. of Montana. This specimen also has a Platycerid snail attached to the calyx (bottom left). These snails were coprophages and would eat expelled waste from the crinoid. #FossilFriday

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Cam Muskelly (Explorer of Deep Time ⏰ ⚒️) @cambriancam.bsky.social · 22/11/2025

Welcome back to #fossilfriday Here is the crinoid Arthroacantha carpenteri with a Platycerid snail attached. These snails are Coprophagous which means they ate fecal matter. The snail would attached to the anal chimney of the crinoid and would feed on the waste. Arkona Shale Mid Devonian Ontario

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David Clark @clarkeocrinus.bsky.social · 30/01/2026

I finally have a nice LeGrand crinoid piece. This Mississippian aged site in Iowa is famous for crinoids with preserved color. The darker crinoid is Rhodocrinites kirbyi and the lighter one is Platycrinites symmetricus. #FossilFriday

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Duncan McIlroy @dmcediacaran.bsky.social · 25/09/2026

Happy #FossilFriday! The Ediacaran of #Newfoundland is famous for its animal fossils. The most iconic are the muscular #Staurozoa #Haootia and #Mamsetia and I think our new 551Ma #Edrathina is probably comparably important , being the oldest relative of comb-jellies, another early animal group.

retrodeformed holotype of Edrathina see strain ellipse branches arise from margin of a calyx which is triangular in shape
interpreted as being a relative of the Ctenophores, the similarly shaped stem-ctenophores like Siphosauctum and Dinomischus

Holotype of Haootia quadriformis linesr features are interpreted as muscle fibres. It has been interpreted as a crown group Cnidarian comparable to the modern Staurozoa
note the tetra-radial form characteristic of that group

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Ceryl @politicdormouse.bsky.social · 24/09/2026

Jeanne Villepreux-Power French marine biologist, worked in Sicily. 1832 1st person to invent aquaria for studying marine life, still used today. Cephalopods researcher. Dressmaker, author, conservationist, 1st woman in Accademia Gioenia di Catania b. #OTD 24 Sep 1794 en.wikipedia.org/wiki/Jeanne_...

Manuscript written by Jeanne Villepreux-Power #WomenInSTEM #HistSTM #HistSTEM

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Harry Savage @harrysavage.bsky.social · 24/09/2026

Some use them for crawling around! Very unusual youtu.be/l1Rqk7QAr_E?...

youtu.be

Terebellid Polychaete worm: Polycirrus (short video)

YouTube video by Cez Borba

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Geoff Read @annelidsci.bsky.social · 24/09/2026

Finnish Malmgren had a brief period of interest in Polychaeta in the 1860's based on some northern expeditions. McIntosh created the genus name. It's a Finnish/Swedish family name. Dour-looking chap.. en.wikipedia.org/wiki/Anders_...

en.wikipedia.org

Anders Johan Malmgren - Wikipedia

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Chris Mah @echinoblog.bsky.social · 23/09/2026

I DO loves a scale worm that live in association with a heart urchin! #wormwednesday is it really called Malmgrenia? what an interesting name! www.inaturalist.org/observations...

inaturalist.org

Malmgrenia castanea

Malmgrenia castanea from Mali Lošinj, HR-PG, HR on September 26, 2023 at 02:38 PM by adrian_bothe

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