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Brachycycloceras
Taxonomy
Brachycycloceras was named by Miller et al. (1933) [Sepkoski's age data: C Serp-l C Bash-u Sepkoski's reference number: 524]. Its type is Brachycycloceras normale.
It was assigned to Orthocerida by Sepkoski (2002); and to Brachycycloceratidae by Teichert et al. (1964), Niko and Mapes (2009).
It was assigned to Orthocerida by Sepkoski (2002); and to Brachycycloceratidae by Teichert et al. (1964), Niko and Mapes (2009).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1933 | Brachycycloceras Miller et al. p. 105 |
| 1964 | Brachycycloceras Teichert et al. p. 232 |
| 2002 | Brachycycloceras Sepkoski |
| 2009 | Brachycycloceras Niko and Mapes pp. 339 - 340 |
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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. †Brachycycloceras Miller et al. 1933
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†Brachycycloceras bransoni Miller and Owen 1934
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Invalid names: Brachycycloceras ohioense Sturgeon 1946 [synonym], Poterioceras mehli Miller and Owen 1934 [synonym]
†Brachycycloceras curtum Meek and Worthen 1860
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Invalid names: Cyrtoceras dilatatum Meek and Worthen 1860 [synonym], Cyrtoceras peculiare Girty 1915 [synonym], Poterioceras subellipticum Miller and Unklesbay 1942 [synonym]
†Brachycycloceras cyclophorum Waagen 1879
†Brachycycloceras normale Miller et al. 1955
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Invalid names: Brachycycloceras kentuckiense Miller et al. 1933 [synonym], Protocycloceras rushense McChesney 1859 [synonym]
†Brachycycloceras rustaqense Niko et al. 1996
†Brachycycloceras washingtonense Gordon 1964
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. Niko and R. H. Mapes 2009 | Longiconic nautiloids with distinct mature shell modification; immature shell annulated with moderate expansion and faint endogastric curvature, more mature shell becomes nonannulated and straight; apical part of mature shell exhibits rapid inflation, but expanding ratios decrease adorally; cross sections of shells are dorsoventrally depressed, subcircular, elliptical to subtrapezoidal with less pointed venter; each annulus has shallow dorsolateral (ocular) sinus; surface lirae well developed in immature shell, becoming subdued or obsolescent in mature shell; sutures roughly transverse; siphuncle small, supracentral with a subcentral to subdorsal position; septal necks suborthochoanitic; cameral and endosiphuncular deposits probably absent. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Aberhan et al. 2004, Kiessling 2004 | |||||
Age range: base of the Brigantian to the top of the Changhsingian or 335.90000 to 251.90200 Ma
Collections (43 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Visean | United Kingdom (Northern Ireland) | B. sp. (211905) | |
| Brigantian | United Kingdom (Northern Ireland) | B. sp. (211904) | |
| Pendleian | USA (Arkansas) | B. washingtonense (157936 158012 158028 160541 160542 160543) | |
| Pendleian | Kazakhstan | B. subquadratum, B. sp. (8421) | |
| Arnsbergian | United Kingdom (England) | B. koninckianum, B. dilatatum (8257) B. koninckianum, B. dilatum (8255) | |
| Kashirian - Myachkovian | USA (New Mexico) | B. sp. (46548) | |
| Desmoinesian | USA (Pennsylvania) | Orthoceras rushense (184079 184098) | |
| Missourian | USA (Ohio) | Orthoceras rushense (175100 175101) | |
| Missourian | USA (Pennsylvania) | Orthoceras rushense, Cyrtoceras curtum (184103 184105) | |
| Missourian | USA (Missouri) | Orthoceras rushense (237767) | |
| Virgilian | USA (Illinois) | B. sp., B. normale (50219) | |
| Virgilian | USA (Ohio) | Orthoceras rushense (71993) | |
| Virgilian | USA (Texas) | B. normale (217893 217905 217908 217915 217952 217969 217977 217979 217992 218006 218017 218024 218027) | |
| Sakmarian | USA (New Mexico) | B. sp. (39155) | |
| Roadian | Oman | B. rustaqense (102388) | |
| Roadian - Wordian | Japan | B. sp. (116007) | |
| Wordian | Tunisia (Madanin) | B. cyclophorum (42091) | |
| Wuchiapingian | Pakistan | Orthoceras cyclophorum (119648) | |
| Wuchiapingian | Azerbaijan | Neocycloceras cyclophorum (95630) | |
| Lopingian | Pakistan | Orthoceras cyclophorum (236237) | |
| Changhsingian | Pakistan | Orthoceras cyclophorum (90251 126933) |