Hebetoceratidae

Hebetoceratidae, a family of Middle and possibly Upper Ordovician nautiloids described as slender orthocones and exogastric cyrtocones in which periodic natural truncation may have occurred. The siphuncle is ventral, commonly subcentral but not marginal.

Hebetoceras, Ecdyceras, and Montyoceras are included genera.

The Hebetoceratidae and included genera were named and described by Rousseau Flower in 1941. Affinity with the Ascocerida is considered uncertain.

References: W.M. Furnish and Brian F. Glenister, 1964. Nautiloidea - Ascocerida. Treatise on Invertebrate Paleontology, Part K.