if you haven’t done so before, could you do the chambered nautilus please?
Have you seen the chambered nautilus (Nautilus pompilius)?
I have now
Yes, in photos/videos
Yes, irl
I'm not sure

seen from Malaysia
seen from Russia
seen from United States
seen from Poland

seen from Ireland
seen from United States
seen from Russia

seen from United States
seen from Malaysia
seen from Brazil
seen from Ireland
seen from Russia
seen from Germany
seen from Türkiye
seen from Sweden
seen from Singapore
seen from Ireland
seen from Maldives
seen from United States

seen from Russia
if you haven’t done so before, could you do the chambered nautilus please?
Have you seen the chambered nautilus (Nautilus pompilius)?
I have now
Yes, in photos/videos
Yes, irl
I'm not sure

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The distinctive pinhole eyes, leathery hood, and numerous tentacles of modern nautiluses were traditionally thought to represent the "primitive" ancestral state of early shelled cephalopods – but genetic studies have found that that nautiluses actually secondarily lost the genes for building lensed eyes, and their embryological development shows the initial formation of ten arm buds (similar to those of coeloids) with their hood appearing to be created via fusing some of the many tentacles that form later.
There's a Cretaceous nautilidan fossil that preserves soft tissue impressions of what appear to be pinhole eyes and possibly a remnant of a hood, so we know these modern-style nautilus features were well-established by the late Mesozoic. But for much more ancient Paleozoic members of the lineage… we can potentially get more speculative.
So, here's an example reconstructed with un-nautilus-like soft parts.
Solenochilus springeri was a nautilidan that lived during the Late Carboniferous, around 320 million years ago, in shallow tropical marine waters covering what is now Arkansas, USA.
Up to about 20cm in diameter, (~8"), its shell featured long sideways spines which may have served as a defense against predators – or possibly as a display feature since they only developed upon reaching maturity.
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Round 3 - Cephalopoda - Nautilida
(Sources - 1, 2, 3, 4)
Order: Nautilida
Common Name: “nautilus” (pl: “nautiluses” or “nautili”)
Families: 1 - Nautilidae
Anatomy: Smooth external shells with internal chambers, 50-90+ tentacles, toothed radula within parrotlike beak
Diet: crustacean molts, hermit crabs, carrion
Habitat/Range: Indo-Pacific ocean, at depths of several hundred metres
Evolved in: Order Nautilida in the Devonian, Family Nautilidae in the Triassic (230 million years ago)
Do you have a favorite in Nautilida?
One or more of my favorite animals is in Nautilida
I love at least one or more of these animals
I like at least one or more of these animals
I am neutral about all of these animals
I dislike all of these animals
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Taxonomy Tournament: Cephalopods
Sepiida. This order is made up of cuttlefish, which have an internal shell called the cuttlebone that is used to control buoyancy.
Nautilida. This order is made up of nautilis, which have a unique planispiral shell, and move via jet propulsion. They're morphologically veyr similar to their ancient relatives, and are often called living fossils.
Which clade of animals is better?
Sepiida
Nautilida
Show results
Vanitasstilleben
by Pieter Claesz. Berchem (Brabantian, 1597 – 1660) oil on panel (61 × 47 cm), 1636
Westfälisches Landesmuseum für Kunst und Kulturgeschichte

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Chambered Nautilus (Nautilus pompilius)
So nautiluses have a beak? Also, why does most paleoart depict ammonites with squid-like characteristics, rather than nautilus ones? Eg. Several large arms rather than dozens of tiny ones.
Yes, like all cephalopods nautiluses have beaks, they’re just harder to see due to the shell and the many tentacles. I couldn’t find a good picture of the beak of a real nautilus, but you can see it in this diagram.
Despite looking superficially similar to nautiluses, it is thought that the ammonite’s closest living relatives are actually the coleoid cephalopods - the squid, octopus, and cuttlefish. We think that the ammonite’s distinctive coiled shell evolved separately over time from their straight-shelled ancestors, bactrites.
So while it is hard to be sure how many arms/tentacles ammonites had (since soft tissue doesn’t generally fossilise), I think a lot of palaeoartists depict them as being similar to modern coleoids in having around 10 arms/tentacles.
This episode of the Palaeocast podcast goes into ammonite evolution (I haven’t actually listened to the episode, but there is some good information/diagrams just on the page).
Also I’m sorry for taking ages to reply to this - I was busy for a while and then forgot that I still had unanswered questions to get to.
Taxonomy Tournament: Cephalopod Finale!
Octopoda. This order is made up of octopuses, predatory marine creatures with eight limbs. Their soft body allows them to squeeze trhough small spaces. They are capable of camouflage and are among the most intelligent animals.
Nautilida. This order is made up of nautilis, which have a unique planispiral shell, and move via jet propulsion. They're morphologically veyr similar to their ancient relatives, and are often called living fossils.
Which clade of animals is better?
Octopoda
Nautilida
Show results