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@vitoninigo.bsky.social Sep 28, 2026, 10:52 AM

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

Bifericeras donovani. Lowermost Pliensbachian

@bergylta.bsky.social Sep 28, 2026, 8:29 AM

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

@nhmbryozoa.bsky.social Sep 28, 2026, 6:26 AM

#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.

@numenini.bsky.social Sep 27, 2026, 9:39 PM

In this reach of the River Little Ouse amazing drifts of #mollusc shells including Great & Keeled Ram's-Horns (Planorbarius corneus, P. carinatus), Great Pond Snail (Lymnaea stagnalis), Horny Orb-Mussel (Sphaerium corneum) & Jenkin's Spire-Snail (Potamopyrgus antipodarum). #MolluscMonday #invert

@numenini.bsky.social Sep 27, 2026, 9:39 PM

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

@bergylta.bsky.social Sep 21, 2026, 9:40 AM

For this #molluscmonday, we feature the Northern Cowrie (Trivia arctica), also known as "Coffee bean" in several languages ☕
Taken 2026-04-06, Dolmsundet marina in Hitra.🦑🤿
Camera: Olympus TG-5

A tiny Northern Cowrie crawling on a piece of a ship wreck. The Northern Cowrie is beige with lighter spots. the substrate is brownish.

@nhmbryozoa.bsky.social Sep 21, 2026, 5:56 AM

#MolluscMonday Steinkerns of rudist bivalves are the most peculiar and perplexing fossils to be found in the Late Cretaceous rocks of SW France. The owners of the holiday home where this example was found assembled a collection of rudist steinkerns believing them to be dinosaur teeth.

@echinoblog.bsky.social Sep 15, 2026, 1:09 AM

decent pic of the carnivorous clam seen by #Okeanos last week at about 5834 m. Hugh MacIntosh Identifies it as "probably Policordia, in the family Lyonsiellidae. They have a big inhalant siphon with a hood that they evert, then suck back in during prey capture." #molluscmonday

tentacled white open siphon adjacent to rock

shell closed but still partially ajar with tentacles

@stephenhkawai.bsky.social Sep 14, 2026, 7:46 PM

#molluscmonday !
Some of us Montreal shell collectors got together this past weekend. One of us was selling off some spare specimens.
#montreal #seashell #collection #naturalhistory

@bergylta.bsky.social Sep 14, 2026, 9:59 AM

For this #molluscmonday we got two teeny tiny Candiella lineata nudibranchs. Was real hard to spot them on the dive actually, but somehow I did it. 🦑🤿
Taken 2026-05-14, Lysekil Archipelago
Camera: Olympus TG-5

Two tiny Candiella lineata sea slugs on a brown-beige rocky bottom. The seaslugs are semi-transparent with two stark-white lines running along their backs. The sea slugs are facing two different directions, the closer one is facing left, the one further away is facing right.

@malacogreece.bsky.social Sep 14, 2026, 7:32 AM

Happy #MolluscMonday !

Our photo contest is over and we are working to find the winners🏆

Stay tuned for news on the audience award!

🐙

#Greece #Ελλαδα #malacology #gastropods #snails #bivalves #cephalopods #nature #biodiversity

@krakenscholar.bsky.social Sep 14, 2026, 6:58 AM

New paper out! 🥳 written together with @nathist.bsky.social colleagues. It contains the first record of this little snail (and 3 bugs) in Finland, found inside the greenhouses of Kaisaniemi Botanic Garden.

You can see the article at: journal.fi/msff/article...

#MolluscMonday #inverts

Oxychilus translucidus crawling over moss.

@nhmbryozoa.bsky.social Sep 14, 2026, 5:38 AM

#MolluscMonday Chess board in which the white squares contain sectioned ammonites. Apologies for the poor resolution of this photo taken several years ago in the Whitby Museum.

@numenini.bsky.social Sep 13, 2026, 11:30 AM

Plenty Swollen River-Mussel (Unio tumidus) in River Little Ouse at Brandon Bank, doubtless assisting alien #invasivespecies, European Bitterling (Rhodeus amarus) which inserts eggs & sperm down siphons to hatch in safety of mussel. Also lots Common River-Snail (Viviparus viviparus). #molluscmonday

@echinoblog.bsky.social Sep 12, 2026, 2:37 AM

OH WOW. A collection of NEOPILINA! A monoplacophoran! Collected by #Okeanos before in 2017,. east seamount, American Samoa #molluscmonday link.springer.com/article/10.1...

@numenini.bsky.social Sep 7, 2026, 8:45 PM

Nice lot of gastropods at Mill Bay #Salcombe #Devon: Common (Littorina littorea) & smaller, higher shore Rough periwinkle (L. saxatilis), Purple Topshell (Steromphala umbilicalis) & Atlantic Dogwhelk (Nucella lapillus), predator of periwinkles, barnacles & mussels. #MolluscMonday #marinelife

@echinoblog.bsky.social Sep 7, 2026, 4:01 PM

MAGNAPINNA from MONTEREY BAY! #molluscmonday! www.latimes.com/california/s...

@ichnologist.bsky.social Sep 7, 2026, 4:00 PM

This photo of dwarf surf clams (Mulinia lateralis) burying themselves in the "quicksand" created by a burrowing knobbed whelk (Busycon carica) is explained further in Chapter 1 of my book, 'Tracking the Golden Isles' (2020, @ugapress.bsky.social). #MolluscMonday www.ugapress.org/978082035696...

Screenshot of the first page of Chapter 1 in my book 'Tracking the Golden Isles' (2020, University of Georgia Press), titled 'Knobbed Whelks, Dwarf Clams, and Shorebirds,' with the following text:

"The beach was teeming with predators. We did not know this before setting out on our bicycles early that morning, and we probably passed over many of these carnivores before recognizing their distinctive and undeniable outlines under the sand. Once these patterns announced the hunters' presence, we understood that they had willingly buried themselves, a waiting game of survival in acquiescence to waning waters. What made this situation even more remarkable, though, was how their submergence also unwittingly supplied temporary refuge for another, much smaller, species—that is, before other predators arrived on the scene and feasted on each of the smaller species as hapless prey.
My wife, Ruth, and I were lucky enough to witness the results of this complicated life-and-death beach drama because we were on vacation. For nearly every Thanksgiving since 2010, instead of giving thanks for family, football, and native fowl, we pay homage to the Georgia coast by placing our feet on its sandy shores. To make this nature therapy happen, we flee the metropolitan Atlanta area either the Wednesday before or the morning of the last Thursday of November and then drive about five hours before stopping on the barrier island of Jekyll."

@ichnologist.bsky.social Sep 7, 2026, 2:58 PM

For #MolluscMonday & #LaborDay, a knobbed whelk (Busycon carica) that buried itself during low tide on a Jekyll Island (GA) beach, its formerly fluidized wake marked by dwarf surf clams (Mulinia lateralis) that burrowed into the still-saturated sand.

Yellow-gray and mostly smooth sandy surface with a raised triangular patch to the left marking a live buried whelk, its lowermost end poking out. To the right are nearly a hundred almond-shaped bumps on the surface from dwarf surf clams that burrowed into the fluidized wake of the whelk.