''Campyloceras'' is a genus of
Lower Carboniferous cephalopod
A cephalopod is any member of the molluscan class Cephalopoda (Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head ...
belonging to the order
Pseudorthocerida
Pseudorthocerida is an order of generally straight longiconic orthoceratoids with a subcentral to marginal cyrtochoanitic siphuncle composed of variably expanded segments which may contain internal deposits that may develop into a continuous pa ...
. 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 tissue passing longitudinally through the shell of a cephalopod mollusk. Only cephalopods with chambered shells have siphuncles, such as the extinct ammonites and belemnites, and the living nautiluses, cuttlefish, and ...
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
''Pseudactinoceras'' is an extinct Nautiloidea, nautiloid cephalopod included in the order Pseudorthocerida and the namesake of the family Pseudactinoceratidae (Sweet, 1964).
Description
''Pseudactinocras'' are slightly depressed longiconic cyrt ...
''. Both are included in the
Pseudactinoceratidae
Pseudactinoceraidae is a family in the cephalopod order Pseudorthocerida, known from the Upper Devonian and Lower Carboniferous ( Mississippian).Nautiloidea-Orthocerida by Walter C Sweet, Treatise on Invertebrate Paleontology Part K Mollusca 3, R ...
.
References
* Walter C. Sweet, 1964. Nautiloidea - Orthocerida.
Treatise on Invertebrate Paleontology, 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