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Choristoceras
Taxonomy
Choristoceras was named by Hauer (1865) [Sepkoski's age data: Tr Nori-u Tr Rhae Sepkoski's reference number: 302]. It is the type genus of Choristocerataceae.
It was assigned to Ceratitida by Sepkoski (2002); and to Choristoceratidae by Spath (1951), Tozer (1979), Tozer (1981), Tozer (1994) and Riccardi (2019).
It was assigned to Ceratitida by Sepkoski (2002); and to Choristoceratidae by Spath (1951), Tozer (1979), Tozer (1981), Tozer (1994) and Riccardi (2019).
Synonymy list
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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. †Choristoceras Hauer 1865
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†Choristoceras ammonitiforme Guembel 1861
†Choristoceras annulatum Guembel 1861
†Choristoceras crickmayi Tozer 1979
†Choristoceras klamathense Smith 1927
†Choristoceras marshi Hauer 1865
†Choristoceras minutus Guex 1995
†Choristoceras nobile Mojsisovics 1893
†Choristoceras nyalamense Yin et al. 2007
†Choristoceras rhaeticum Gümbel 1861
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Invalid names: Crioceras coronatum Schafhaeutl 1863 [synonym], Crioceras debile Dittmar 1864 [synonym]
†Choristoceras robustum Taylor and Guex 2002
†Choristoceras shoshonensis Taylor and Guex 2002
†Choristoceras tortiliforme Guembel 1861
Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 7 | 11.8 | 10.5 | 14.5 | 11.2 | 1.80 | |
| shell diameter | 7 | 29.0 | 18.8 | 47.0 | 30.0 | 9.36 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: base of the Norian to the top of the Hettangian or 228.00000 to 199.30000 Ma
Collections (72 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Tuvalian | USA (California) | C. klamathense (142611) | |
| Norian | Indonesia (Timor) | C. sp. (205321) | |
| Lacian | Indonesia (Maluku) | C. sp. (204318) | |
| Sevatian | USA (Nevada) | C. sp. 1 (37246) C. sp. 2 (37247) C. sp. 2, C. marshi (37249) | |
| Rhaetian | USA (California) | C. marshi (38332 38333 38334) | |
| Rhaetian | China | C. nobile, C. marshi (73932) | |
| Rhaetian | Mexico (Sonora) | C. nobile (100240) C. sp. (34984 100241) | |
| Rhaetian | Peru | C. sp. (209034 209037 209038 209054) | |
| Rhaetian | Argentina (Mendoza) | C. sp., C. marshi (50817) | |
| Rhaetian | Hungary | C. sp. (42778 42779 42780) | |
| Rhaetian | Indonesia (Timor) | C. marshi (205453) | |
| Rhaetian | Austria | C. ammonitiforme (173620 173621) C. marshi (100107 173612 173623) C. rhaeticum, C. marshi (173616) | |
| Rhaetian | Austria (Tirol) | C. marshi (208592) | |
| Rhaetian | Peru (Amazonas) | C. nobile (100243) | |
| Rhaetian | Germany | C. ammonitiforme (173601) C. marshi, C. ammonitiforme (173609) C. rhaeticum (173604 173605) C. rhaeticum, C. ammonitiforme (139355 173602 173607 173608 173617) C. rhaeticum, C. marshi, C. ammonitiforme (173622) C. rhaeticum, C. marshi, C. ammonitiforme, C. annulatum, C. tortiliforme (173603) C. sp. (173606) C. tortiliforme (173613 173615) | |
| Rhaetian | Canada (British Columbia) | C. crickmayi (137062 137962 137967) C. nobile (141763 141769) C. rhaeticum (141764 141770) C. sp. (45379 100585) | |
| Rhaetian | Austria (Calcareous Alps) | C. marshi (38141) | |
| Rhaetian | Chile | C. marshi (209314) C. sp. (209293 209315) | |
| Rhaetian | USA (Nevada) | C. crickmayi (76610) C. crickmayi, C. shoshonensis (76608) C. marshi (76607) C. rhaeticum (157636) C. robustum (157624) C. shoshonensis (157634) | |
| Hettangian | China | C. nyalamense (73933) | |
| Early/Lower Hettangian | Austria (Tirol) | C. marshi (208599) | |
| Early/Lower Hettangian | USA (Nevada) | C. minutus (188597 188657) | |
| Early/Lower Hettangian | Canada (British Columbia) | C. minutus (97506 97512 97513) | |
| Early/Lower Hettangian | Peru | C. sp. (209219) | |
| Planorbis | USA (Nevada) | C. minutum (76621) |