Ascoceratidae

Ascoceratidae, a family of nautiloid cephalopods and part of the Ascocerida, named by Barrande in 1867. Shells consists of an early, deciduous, longiconic stage that underwent periodic truncation, as in the Hebetoceratidae, and a mature, inflated breviconic ascoceroid section. Range is from the middle Ordovician to the upper Silurian.

Ascoceratid genera include Ascoceras, Aphragmites, Billingsites, Glossoceras, '                                                                                                                  Lindstroemoceras, Parascoceras, Probillingsites,  Schuchertoceras, and Shamattawaceras.

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