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Cyrtorizoceras
Taxonomy
Cyrtorizoceras was named by Hyatt (1900). Its type is Cyrtoceras minneapolis.
It was assigned to Rizoceratidae by Hyatt (1900); to Oncoceratida by Sepkoski (2002); and to Oncoceratidae by Teichert et al. (1964) and Kröger (2013).
It was assigned to Rizoceratidae by Hyatt (1900); to Oncoceratida by Sepkoski (2002); and to Oncoceratidae by Teichert et al. (1964) and Kröger (2013).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1900 | Cyrtorizoceras Hyatt p. 529 |
| 1964 | Cyrtorizoceras Teichert et al. p. 284 |
| 2002 | Cyrtorizoceras Sepkoski |
| 2013 | Cyrtorizoceras Kröger |
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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 minneapolis Clarke 1897
†Cyrtorizoceras rusti Flower 1952
†Cyrtorizoceras tenue Strand 1934
†Cyrtorizoceras thorslundi Kröger 2013
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Hyatt 1900 | Sections 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. |