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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), Kröger (2013).
It was assigned to Rizoceratidae by Hyatt (1900); to Oncoceratida by Sepkoski (2002); and to Oncoceratidae by Teichert et al. (1964), Kröger (2013).
Species
Species lacking formal opinion data
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. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Aberhan et al. 2004 | |||||
Age range: base of the Katian to the top of the Chesterian or 452.80000 to 323.40000 Ma
Collections (23 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Caradoc | China (XinJiang) | C. sp. (20802) | |
| Late/Upper Ordovician | Canada (Quebec) | C. sp. (24174) | |
| Blackriveran | USA (Illinois, Iowa, Wisconsin) | C. minneapolis (23753 23756 23757 23758) | |
| Shermanian | USA (New York) | C. rusti (89092) C. sp. (76092) | |
| Chatfieldian | USA (New York) | C. sp. (337 431 76091) | |
| Katian | Sweden (Dalarna) | C. thorslundi (124939) | |
| Katian - Hirnantian | Sweden (Dalarne) | C. thorslundi (73413) | |
| Richmondian | Canada (Nunavut) | C. arcticum (24124) | |
| Pirgu | Norway (Ringerike) | C. tenue (162233) | |
| Rawtheyan | United Kingdom (Scotland) | C. sp. (189028) | |
| Telychian | Ireland (Connacht) | C. sp. (89146) | |
| Telychian - Wenlock | Canada (Manitoba) | C. sp. (26636) | |
| Sheinwoodian | USA (Wisconsin) | C. dardanus, C. unguicurvatum (13069 13075) | |
| Wenlock - Silurian | USA (Wisconsin) | C. dardanus, C. unguicurvatum (13104) C. fosteri, C. lucillum (13107) | |
| Chesterian | USA (Oklahoma) | Cyrtorhizoceras hyattianum (584) |