Carinonautilus is a genus of extinct, Middle Cretaceous nautilid with a very involute, compressed shell in which the whorl section is higher than wide, umbilicus is small and shallow, or flanks converge on a narrow venter that has a rounded keel. A furrow on either side marks the ventro-lateral shoulder.
| Carinonautilus Temporal range:
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Nautilida |
| Family: | Nautilidae |
| Genus: | †Carinonautilus Spengler, 1910 |
The genus was erected by Spengler in 1910 on the basis of the holotype, found in Middle Cretaceous strata from India.
References
edit- Bernard Kummel, 1964. Nautiloidea -Nautilida.Treatise on Invertebrate Paleontology, Part K. Geological Society of America and University of Kansas Press.