Cyrtoceras

For the plant species also known as Cyrtoceras elegans, see Hoya celebica.

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 Temporal range: Middle Ordovician–Middle Devonian[1] 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