Gryponautilus
Appearance
Gryponautilus Temporal range: Late Triassic
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Genus: | Gryponautilus Mojsisovics, 1902
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Gryponautilus is an Upper Triassic nautilid (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.
Immature forms bear a resemblance to Grypoceras.
References
- 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.