Gryponautilus is a genus of Upper Triassic nautilids (generally coiled nautiloid cephalopods) belonging to the trigonoceratacean family Grypoceratidae, characterized by involute, inflated shells, which at maturity develop narrowly rounded keel-like venters. Venters on inner whorls are truncated and broadly convex to concave.
| Gryponautilus Temporal range: Late Triassic
| |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Nautilida |
| Family: | †Grypoceratidae |
| Genus: | †Gryponautilus Mojsisovics, 1902 |
Immature forms bear a resemblance to Grypoceras.
References
edit- R.C. Moore, ed. (1964). Part K, Mollusca 3. Treatise on Invertebrate Paleontology. Lawrence, Kansas: Geological Society of America and University of Kansas Press. p. K190–K216.
 | This prehistoric nautiloid-related article is a stub. You can help Wikipedia by expanding it. |