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Cyrtorizoceras

Cephalopoda - Oncocerida - Oncoceratidae

Synonymy list
YearName and author
1900Cyrtorizoceras Hyatt p. 529
1964Cyrtorizoceras Teichert et al. p. 284
2002Cyrtorizoceras Sepkoski
2013Cyrtorizoceras Kröger

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
RankNameAuthor
phylumMollusca
classCephalopodaCuvier 1797
subclassMulticeratoidea()
orderOncocerida()
familyOncoceratidaeHyatt 1884
genusCyrtorizoceras

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

G. †Cyrtorizoceras Hyatt 1900
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Cyrtorizoceras borni Teichert 1930
Cyrtorizoceras rusti Flower 1952
Cyrtorizoceras tenue Strand 1934
Cyrtorizoceras thorslundi Kröger 2013
Diagnosis
ReferenceDiagnosis
A. Hyatt 1900Sections more compressed than in Rizoceras, living chamber shorter and apt to be more or less laterally compressed in gerontic stage, but the dorso-ventral
diameters only very slightly so or not at all. Sutures more sinuous, and with decided ventral and dorsal saddles.