''Campyloceras'' is a genus of
Lower Carboniferous
Lower may refer to:
* ''Lower'' (album), 2025 album by Benjamin Booker
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*Lower Township, New Jersey
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*Lower Wick
Lower Wick is a small hamlet located in the county of Gloucestershire, England. It is sit ...
cephalopod
A cephalopod is any member of the molluscan Taxonomic rank, class Cephalopoda (Greek language, Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral symm ...
belonging to the order
Pseudorthocerida
Pseudorthocerida is an order of generally straight longiconic (consisting of longicones - long, thin conic shells) orthoceratoids with a subcentral to marginal cyrtochoanitic siphuncle composed of variably expanded segments which may contain in ...
. The species has an elongate, moderately curved, shell. Curvature is greatest toward the apex and lessens in the adult portion. The
siphuncle
The siphuncle is a strand of biological tissue, tissue passing longitudinally through the mollusc shell, shell of a cephalopod mollusc. Only cephalopods with chambered shells have siphuncles, such as the extinct ammonites and belemnites, and the li ...
is central to subcentral with moderately to strongly inflated segments.
Cameral deposits are well developed on the convex side, toward the apex while only thin on the concave side, making the curvature exogastric.
Named by McCloy in 1844, the genus is related to ''
Pseudactinoceras''. Both are included in the
Pseudactinoceratidae.
References
* Walter C. Sweet, 1964. Nautiloidea - Orthocerida.
Treatise on Invertebrate Paleontology
The ''Treatise on Invertebrate Paleontology,'' published from 1953–2007 by the Geological Society of America and the University of Kansas, then 2009–present by the University of Kansas Paleontological Institute, is a definitive multi-authore ...
, Part K. Geological Society of America and University of Kansas Press.
* Bjorn Kroger, 2007. Carboniferous Actinoceroid Nautiloidea (Cephalopoda): a new perspective. Journal of Paleontology, July 2007;
{{Taxonbar, from=Q5028752
Prehistoric nautiloid genera