Pseudonautilidae
| Pseudonautilidae Temporal range: Jurassic–Cretaceous |
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|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Nautilida |
| Superfamily: | Nautilaceae |
| Family: |
Pseudonautilidae Shimanskiy and Erlanger 1955 |
| Genera | |
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see text |
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see text
Pseudonautilidae is a family of Jurassic and Lower Cretaceous nautilid cephalopods belonging to the same superfamily as modern Nautilus, Nautilaceae, but forming a different branch from the family Nautilidae. Pseudonautilids, together with other nautilids, were contemporary with the ammonoids, which comprise an entirely different set of shelled cephalopod stocks more closely related to octopi and squid.
Pseudonautilids are characterized by an involute, generally compressed, nautiliconic shell; highly sinuous "goniatitic" sutures; and siphuncle generally located between the center and venter. Three genera are included.
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