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.
The genus was erected by Spengler in 1910 on the basis of the holotype, found in Middle Cretaceous strata from India.
Source: "Carinonautilus", Wikipedia, Wikimedia Foundation, (2021, May 13th), https://en.wikipedia.org/wiki/Carinonautilus.
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- Bernard Kummel, 1964. Nautiloidea -Nautilida.Treatise on Invertebrate Paleontology, Part K. Geological Society of America and University of Kansas Press.
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