Temporal range: L Ordovician (Cassinian)
Hook and Flower, 1977
Veneficoceras is a member of the rod-bearing Baltoceratidae, an extinct cephalopod family with characteristics of the orthoceratoid Dissidocerida, found in Cassinianage, Lower Ordovician, limestone in western Utah.
Veneficoceras has a large tubular siphuncle with thin connecting rings that lies along the interior ventral margin. The endosiphuncular rod appears in vertical section to bifurcate into a larger ventral rod on the bottom and a smaller and shorter dorsal rod on top. In cross section a complete lining all around would probably appear, with a dorsally offset central opening.
Veneficoceras is represented only by the type species, Venificoceras susanae of which there is only the holotype, a 40 millimetres (1.6 in) long portion of a phragmocone that came from a little over 15 metres (49 ft) above the base of the Wahwah limestone in the Ibex area, western Utah.
- Stephen C. Hook and Rousseau H. Flower 1977. Late Canadian (Zones J,K) Cephalopod Faunas from Southwestern United States. Memoir 32, New Mexico Bureau of Mines and Mineral Resources.