Sactorthoceratidae

Systematic Paleontology Class Cephalopoda Subclass Nautiloidea Order Orthocerida Family Sactorthoceratidae

The Sactorthoceratidae is a family of middle Ordovician orthocerid nautiloids named by Rousseau Flower in 1946. The siphuncle is subcentral, siphuncle and chambers (camerae) are typically free of organic deposits. Includes Sactorthoceras, Centroonoceras, and Sigmocycloceras.

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