Cyrtoceras Knowpia

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
Type species
	†Cyrtoceras minneapolis; Whiteaves, 1890
Species
	†Cyrtoceras manitobense Whiteaves, 1890 ; †Cyrtoceras minneapolis Clarke, 1897 ;

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.

References edit

^ 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.
^ "Cyrtoceras". Global Biodiversity Information Facility. Retrieved 6 November 2021.

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