Centroonoceras

Systematic Paleontology Order Orthocerida Family Sactorthoceratidae Genus Centroonoceras

Centroonoceras is a mid Ordovician genus included in the Sactorthoceratidae with a cyrtoconic shell by which it differs from the genus Sactorthoceras. The siphuncle is subcentral and suborthochoanitic in which the segments are elongate, subfusiform, generally straighter of the upper, dorsal, side than on the lower, ventral.

Centroonoceras fossils have been found in New York state in the U.S. and in Korea.

References: Walter C. Sweet, 1964. Nautiloidea -Orthocerida Treatise on Invertebrate Paleontology, Part K.