Spyroceratidae
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Spyroceratidae | |
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Scientific classification ![]() | |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Cephalopoda |
Order: | †Pseudorthocerida |
Family: | †Spyroceratidae Shimazu & Obata 1935 |
Spyroceratidae are defined[1] as Pseudorthocerida with uniformly slender siphuncle segments, longer than wide, that contract sharply near either end, in which endosiphuncular deposits first form a compete annulus before fusing ventrally.
References
- ^ Sweet, Walter C. 1964. Nautiloidea -Orthocerida. Treatise on Invertebrate Paleontology, Part K. Geological Soc. of America and Univ of Kansas press
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- Orthoceratoidea
- Prehistoric cephalopod families
- Paleozoic cephalopods
- Carboniferous cephalopods
- Devonian cephalopods
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- Silurian cephalopods
- Silurian first appearances
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