Orthoceras (big) and Lituites
December 23, 2025 at 6:23 PM
Orthoceras (big) and Lituites
Diplomoceras (the clippy) and Pseudocenoceras
December 23, 2025 at 3:32 AM
Diplomoceras (the clippy) and Pseudocenoceras
January 29, 2025 at 5:04 PM
I am re-learning the difference between nautiloids (late Cambrian -> now) and ammonites (entirely extinct, Devonian -> late Cretaceous*) and also the third . Both of these guys are nautiloids
December 23, 2025 at 6:38 PM
I am re-learning the difference between nautiloids (late Cambrian -> now) and ammonites (entirely extinct, Devonian -> late Cretaceous*) and also the third . Both of these guys are nautiloids
Orthoconic cephalopod fossils (likely nautiloids, Orthocerida) preserved in a marine limestone slab.
These Paleozoic cephalopods (~400 Ma) are early relatives of modern squid and octopus, belonging to the same class (Cephalopoda), before the evolution of reduced or internal shells.
#fossils #geology
These Paleozoic cephalopods (~400 Ma) are early relatives of modern squid and octopus, belonging to the same class (Cephalopoda), before the evolution of reduced or internal shells.
#fossils #geology
March 12, 2026 at 9:21 PM
Ordovician illustration for James Stryker's paleoart project.
#Illustration #Paleoart #Paleoillustration #Ordovician
#Illustration #Paleoart #Paleoillustration #Ordovician
February 3, 2026 at 7:59 PM
Ordovician illustration for James Stryker's paleoart project.
#Illustration #Paleoart #Paleoillustration #Ordovician
#Illustration #Paleoart #Paleoillustration #Ordovician
Nautiloids and Illithids alike fear this:
June 24, 2025 at 12:13 AM
Nautiloids and Illithids alike fear this:
March 14, 2025 at 3:33 AM
Today I learned: nautiloids were both incredibly important and incredibly diverse… *and then the seals came*. As in, the fossil record shows the spread of pinnipeds in a region, and then the extinction of the nautiloids. Today nautili live only in tropical waters with no pinnipeds.
SEALS >:[
SEALS >:[
March 13, 2024 at 10:36 PM
Today I learned: nautiloids were both incredibly important and incredibly diverse… *and then the seals came*. As in, the fossil record shows the spread of pinnipeds in a region, and then the extinction of the nautiloids. Today nautili live only in tropical waters with no pinnipeds.
SEALS >:[
SEALS >:[
at the highest reaches, one relishes things that stop resembling the common earthly forms of life. urchins, nautiloids, conch, echinoderms
July 23, 2026 at 8:34 PM
at the highest reaches, one relishes things that stop resembling the common earthly forms of life. urchins, nautiloids, conch, echinoderms
Crinoids and brachiopods and nautiloids, we’ve got, but not one ammonite? A tragedy. And don’t even get me started on being hundreds of millions of years too late for opabiniids.
October 13, 2024 at 6:59 PM
Crinoids and brachiopods and nautiloids, we’ve got, but not one ammonite? A tragedy. And don’t even get me started on being hundreds of millions of years too late for opabiniids.
daily mollusk. Nautilus and Allonautilus are the only living genera of nautiloids, a once very diverse group of cephalopod mollusks 🧪
September 20, 2025 at 6:15 PM
daily mollusk. Nautilus and Allonautilus are the only living genera of nautiloids, a once very diverse group of cephalopod mollusks 🧪
(oncocerid cephalopods, ancient nautiloids and cousins of this guy)
May 2, 2025 at 3:16 AM
(oncocerid cephalopods, ancient nautiloids and cousins of this guy)
Accidentally left the simulation running for a few hours without realizing; came back to a world full of opalescent nautiloids
July 6, 2025 at 11:36 AM
Accidentally left the simulation running for a few hours without realizing; came back to a world full of opalescent nautiloids
#MolluscMonday Photographed at Hampton Court Palace last week, orthocone nautiloids in paving slabs of Swedish Ordovician limestone. A microfault crosses the chambered phragmocone of one. The other fossil may represent a siphuncular structure but comments would be welcomed.
September 22, 2025 at 7:06 AM
#MolluscMonday Photographed at Hampton Court Palace last week, orthocone nautiloids in paving slabs of Swedish Ordovician limestone. A microfault crosses the chambered phragmocone of one. The other fossil may represent a siphuncular structure but comments would be welcomed.
Movies are certain there are only three fossils that have ever existed: trilobites, nautiloids, and complete T-Rex skeletons.
sometimes there is absolutely nothing more fun than understanding works of art through people's varied professional perspectives
You can/should read Emily Wilson's latest take on the Odyssey, but I'm logging on to convey my hairdresser's reaction.
She was AGHAST that Nolan, with his million $ budget, gave Matt Damon ONLY 6 hair extensions. As a result, his hair did not blow around properly, & that ruined the film for her.
She was AGHAST that Nolan, with his million $ budget, gave Matt Damon ONLY 6 hair extensions. As a result, his hair did not blow around properly, & that ruined the film for her.
August 5, 2026 at 10:20 AM
Movies are certain there are only three fossils that have ever existed: trilobites, nautiloids, and complete T-Rex skeletons.
I love nautiloids 🧪
#MolluscMonday Small individual (5 cm across) of the Middle Jurassic nautiloid Cenoceras smithi from Dundry in Somerset.
March 30, 2026 at 5:26 PM
I love nautiloids 🧪
#MolluskMonday ... Here we have densely packed phragmocones of late Ordovician orthocone nautiloids, a highlight of the Cincinnatian limestones. 🧪⚒️
One of my favorite field trip outcrops was a slab of nautiloid shells oriented parallel to wave ripples in the spillway at Caesar Creek.
One of my favorite field trip outcrops was a slab of nautiloid shells oriented parallel to wave ripples in the spillway at Caesar Creek.
December 15, 2025 at 10:23 PM
#MolluskMonday ... Here we have densely packed phragmocones of late Ordovician orthocone nautiloids, a highlight of the Cincinnatian limestones. 🧪⚒️
One of my favorite field trip outcrops was a slab of nautiloid shells oriented parallel to wave ripples in the spillway at Caesar Creek.
One of my favorite field trip outcrops was a slab of nautiloid shells oriented parallel to wave ripples in the spillway at Caesar Creek.
April 17, 2025 at 1:22 PM
learning about the different shapes of nautiloids and ammonites. most of wikipedia's example photos are either lush and colorful reconstructions of the live animal or photos of the fossils all polished and nice. for oncocerida though it's just this
December 23, 2025 at 5:06 PM
learning about the different shapes of nautiloids and ammonites. most of wikipedia's example photos are either lush and colorful reconstructions of the live animal or photos of the fossils all polished and nice. for oncocerida though it's just this
Ideally once I come up with the Perfect Introduction to the long names book I can just start making more specific-taxon sequels to keep my mind busy during this Everything. So like five more A-Z books but one of them is all nautiloids, one of them is all rotifers, fireflies, parasitic plants, etc.
January 20, 2026 at 1:59 PM
Ideally once I come up with the Perfect Introduction to the long names book I can just start making more specific-taxon sequels to keep my mind busy during this Everything. So like five more A-Z books but one of them is all nautiloids, one of them is all rotifers, fireflies, parasitic plants, etc.
Yeah, Nautiloids have had it FAR too easy, they need to get outta biodiversity's way.
July 9, 2024 at 7:33 PM
Yeah, Nautiloids have had it FAR too easy, they need to get outta biodiversity's way.