Ctenoceras Noetling, 1884

Taxon description

Kröger & Isakar, 2006

Diagnosis. Slightly cyrtoconic, slightly compressed shell, with prominent sinuous, irregularly spaced annulation, growth lines, and fine longitudinal costules. Body chamber with two impressions at the concave parts of the flanks andone at the convex side. Siphuncle subcentral toward the convex side of the shell, nearly tubular with orthochoanitic septal necks. No endosiphuncular and cameral deposits known.

Selection of related publications
Kröger, B. 2007. Concentrations of juvenile and small adult cephalopods in the Hirnantian cherts (Late Ordovician) of Porkuni, Estonia. Acta Palaeontologica Polonica 52, 3, 591-608.
Kröger, B., Isakar, M. 2006. Revision of annulated orthoceridan cephalopods of the Baltoscandic Ordovician. Fossil Record 9, 1, 137-163. DOI:10.1002/mmng.200600005
Kröger, B. 2004. Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia. Acta Palaeontologica Polonica 49, 1, 57-74.