Dr Craig R McClain In 1962 David Raup used an IBM 7090 and a plotter to turn four numbers into snails. Turn one dial, translation, and a flat ramshorn coil becomes a planospiral snail becomes a tower shell. 🧪🐌 #MolluscMonday #SciArt
Mollusc Monday
by @rachelvetica.bsky.social
A feed showing posts with the hashtag #molluscmonday or the phrase "daily mollusk" | feed icon image source: https://commons.wikimedia.org/wiki/File:Helix_aspersa_3645301882.jpg
Pull to refresh
Dr Craig R McClain 
Emil For this #molluscmonday we got a large one, the Tritonia hombergii. This sea slug grows to about 20 cm, which is gigantic compared to most other species in Sweden. Taken: 2026-05-14. Bergylteskär, Lysekil. Camera: Olympus TG-5 🤿🦑
Tom Sharpe 1 / 2
#MolluscMonday: spotted this clam shell decoration on a visit yesterday to Newhailes, cared for by the National Trust for Scotland. Thought at first that they were moulded plaster but they’re real, gilded, clam shells from 1816 or earlier.
Paul D. Taylor #MolluscMonday Scratched by the feet of countless visitors unaware of its existence, a Carboniferous gastropod in a memorial stone in the cloisters of Westminster Abbey.
Dr Craig R McClain 1 / 2
More geekery tonight. Trying to make sure my code worked as intended and generating Raup's Figure 2 from his 1962 paper "Computer as Aid in Describing Form in Gastropod Shells" #marinelife #SciArt #paleobiology #MolluscMonday #paleontology
Dr Craig R McClain Finally got around to making Raup's mollusk shell model work in R. Also spent too much time trying to give a retro look. #marinelife #molluscmonday
Matt Bracken *Megathura* for #MolluskMonday! 🌊🦑 #MarineLife #MolluscMonday
Stephen H Kawai #molluscmonday ! I just received some gorgeous Vietnamese Amphidromus. The larger specimen (A. heinrichhuberi) measures 60 mm. The pair of smaller ones (A. jomi) is named after a friend. #mollusk #invertebrate #snail #gastropod #collection #naturalhistory
Chris Mah 1 / 2
Two further slit shells, Pleurotamariids from Puerto Rico, 283m or thereabouts, Vieques Island seen by #Okeanos in 2018 during the Oceando Profundo expedition #molluscmonday
Íñigo Vitón 1 / 3
🇬🇧🐚 #MolluscMonday at Robin Hood's Bay (Yorkshire) section, the Pliensbachian GSSP #Jurassic #ammonites [See ALT for captions]
Emil 1 / 4
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
Paul D. Taylor #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.
Emil 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
Paul D. Taylor #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.
Chris Mah 1 / 3
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
Stephen H Kawai 1 / 3
#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
Emil 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
Rodrigo Salvador 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
Paul D. Taylor #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.
Chris Mah 1 / 3
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...
Anthony (Tony) J. Martin 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...
Anthony (Tony) J. Martin 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.
Emil 1 / 2
For this #molluscmonday, we got the Violet sea slug (Edmundsella pedata). 🤿🦑 Taken: 2026-05-14 Camera: Olympus TG-5 #aquaticlife #edmundsellapedata #macrophotography #marinelife #nudibranch #nordicdiving #olympustg5 #scuba #swedishdiving #underwatermacrophotography
Paul D. Taylor #MolluscMonday The oldest antique I could find at the brocante in Bors, Charente, was this ammonite, probably Macrocephalites from the Middle Jurassic (Callovian), and hence more than 160 million years older than anything else in the store.
Stephen H Kawai #molluscmonday ! Amphidromus is a lovely genus of landsnails. These specimens are from Vietnam and Laos and are about an inch long #mollusk #invertebrate #seashell #gastropod #collection #marinelife #naturalhistory