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Brachycycloceras

Cephalopoda - Orthocerida - Brachycycloceratidae

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).

Synonymy list
YearName and author
1933Brachycycloceras Miller et al. p. 105
1964Brachycycloceras Teichert et al. p. 232
2002Brachycycloceras Sepkoski
2009Brachycycloceras Niko and Mapes pp. 339 - 340

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
RankNameAuthor
phylumMollusca
classCephalopodaCuvier 1797
subclassOrthoceratoidea(M'Coy 1844)
orderOrthoceridaKuhn 1940
familyBrachycycloceratidaeFurnish et al. 1964
genusBrachycyclocerasMiller et al. 1933

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 normale Miller et al. 1955
Brachycycloceras rustaqense Niko et al. 1996
Diagnosis
ReferenceDiagnosis
S. Niko and R. H. Mapes 2009Longiconic 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.