Cyrtoceras
Cyrtoceras is an extinct genus of oncoceridan nautiloids that lived from the middle Ordovician to the middle Devonian, in Africa, Europe, North America and South America.
Cyrtoceras | |
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Digital life restoration of "Cyrtoceras sp" | |
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Genus: | Cyrtoceras |
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References
- Teiichi KOBAYASHI (1987). "The Ancestry of the Cephalopoda: From Helcionella to Plectronoceras". Proceedings of the Japan Academy. Ser. B: Physical and Biological Sciences. 63 (5): 135. doi:10.2183/pjab.63.135.
Sources
- Fossils (Smithsonian Handbooks) by David Ward
- Fossils (A Golden Guide from St. Martin's Press) by Frank H. T. Rhodes, Paul R. Shaffer, Herbert S. Zim, and Raymond Perlman
- Aquagenesis: The Origin and Evolution of Life in the Sea by Richard Ellis
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