Allocotoceras

Allocotoceras is an endocerid from the Lower Ordovician (upper Canadian) Karmberg Formation of Australia (Tasmania),^[1] included in the Endoceratidae, based on small, straight or gently curved siphuncles.

Allocotoceras Temporal range: Darriwilian ~468–461 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	†Endocerida
Family:	†Endoceratidae
Genus:	†Allocotoceras Teichert & Glenister 1953

Septal necks, according to Teichert, 1964, are holochoanitic, reaching to the previous septum. Endocones are described as having a dorsal wedge, or process, making the internal opening, or endosiphocone, semicircular in cross section. In this sense Allocotoceras seems to resemble the genus Najaceras.