Spyroceratidae
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.
| Spyroceratidae | |
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| Family: | Spyroceratidae Shimazu & Obata 1935 |
References
- Sweet, Walter C. 1964. Nautiloidea -Orthocerida. Treatise on Invertebrate Paleontology, Part K. Geological Soc. of America and Univ of Kansas press
Notable fossil cephalopods (listed by first occurrence) | |||||||||
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| Cambrian |
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