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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].
It was assigned to Orthocerida by Sepkoski (2002); and to Brachycycloceratidae by Teichert et al. (1964) and Niko and Mapes (2009).
It was assigned to Orthocerida by Sepkoski (2002); and to Brachycycloceratidae by Teichert et al. (1964) and Niko and Mapes (2009).
Species
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 curtum Meek and Worthen 1860
†Brachycycloceras cyclophorum Waagen 1879
†Brachycycloceras normale Miller et al. 1955
†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: Kiessling 2004, Aberhan et al. 2004 | |||||
Age range: base of the Brigantian to the top of the Changhsingian or 336.00000 to 252.17000 Ma
Collections (35 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 | Kazakhstan | B. subquadratum, B. sp. (8421) | |
| Pendleian | USA (Arkansas) | B. washingtonense (157936 158012 158028 160541 160542 160543) | |
| Arnsbergian | United Kingdom (England) | B. dilatum, B. koninckianum (8255) B. koninckianum, B. dilatatum (8257) | |
| Kashirian - Myachkovian | USA (New Mexico) | B. sp. (46548) | |
| Missourian | USA (Pennsylvania) | Cyrtoceras curtum (184103 184105) | |
| Virgilian | USA (Texas) | B. normale (217893 217905 217908 217915 217952 217969 217977 217979 217992 218006 218017 218024 218027) | |
| Virgilian | USA (Illinois) | B. sp., B. normale (50219) | |
| 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) | |
| Changhsingian | Pakistan | Orthoceras cyclophorum (90251 126933) |