Carbactinoceras

Carbactinoceras shells are straight and generally unknown beyond the early growth stage. The siphuncle is large, central to subcentral; segments inflated, septal necks cyrochoantiic and recumbent. The endosiphuncular canal system observed is well developed with thin radial canals perpendicular to the central canal, and leading to a narrow seam along the connecting rings called a perispatium.

Although Carbactinoceras had been considered an actinocerid according to the American Teatise Part K, 1964, based on the internal characters of the siphuncle, the initial chambers of the phragmocone indicate that this genus is an actinoceroid homeomorph (lookalike) belonging phylogenetically to the Pseudorthocerida

This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. Please help improve this article by introducing more precise citations. (December 2013) (Learn how and when to remove this message)

• Bjorn Kroger 2007. Carboniferous Actinoceratoid Nautiloidea (Cephalopoda) - a new perspective) . Journal of Paleontology, July 2007
• Curt Teichert, 1964. Actinoceratoidea. Treatise on Invertebrate Paleontology, Part K. Geological Society of America and University of Kansas Press.
• Carbactinoceras Paleobiology Database Archived 2007-10-01 at the Wayback Machine
• J.J. Sepkoski 2002. List of Cephalopod genera.

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