Cyrtoceras

Cyrtoceras; Temporal range: Middle Ordovician–Middle Devonian PreꞒ Ꞓ O S D C P T J K Pg N [dead link]
	Digital life restoration of "Cyrtoceras sp"
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	†Oncocerida
Genus:	†Cyrtoceras; Conrad, 1838

Cyrtoceras is an dubious extinct genus of oncoceridan nautiloids that was used for fossils from the middle Ordovician to the middle Devonian, in Africa, Europe, North America and South America.

As for 1964, this genus is no longer considered as valid, as it has not been correctly established.^[2]^[3]

References

^ Teiichi KOBAYASHI (1987). "The Ancestry of the Cephalopoda: From Helcionella to Plectronoceras". Proceedings of the Japan Academy, Series B: Physical and Biological Sciences. 63 (5): 135–138. Bibcode:1987PJAB...63..135K. doi:10.2183/pjab.63.135.
^ Teichert, C.; Kummel, B.; Sweet, W. C.; Stenzel, H. B.; Furnish, W. M.; Glenister, B. F.; Erben, H. K.; Moore, R. C.; Nodine Zeller, D. E. (1964). "Cephalopoda – general features, Endoceratoidea – Actinoceratoidea – Nautiloidea – Bactritoidea In R. C. Moore (Ed.), Treatise on Invertebrate Paleontology, Part K, Mollusca 3". Lawrence: The University of Kansas Press: 1–519.
^ Afhüppe, Lukas; Becker, R. Thomas (2022-09-01). "A new discosorid and some other nautiloids from the Givetian of the Rhenish Massif, Germany". Palaeobiodiversity and Palaeoenvironments. 102 (3): 613–627. doi:10.1007/s12549-022-00541-3. ISSN 1867-1608.

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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