Aulacosphinctoides

Aulacosphinctoides is an extinct ammonoid cephalopod that lived during the Late Jurassic (Late Kimmeridgian to early Tithonian), included in the ammonitid family Perisphinctidae.

Aulacosphinctoides Temporal range: Kimmeridgian–Tithonian[1] PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Perisphinctidae
Genus:	†Aulacosphinctoides Spath, 1923
Species
See text

The shell of Aulacosphinctoides is evolute, whorls broadly rounded, ribs sigmoid that mostly bifurcate, but often trifurcate, Lappets present. Closely resembles Torquantisphinctes, differing in having more rounded or depressed whorls and more sigmoid and frequently triplicate ribbing.

The genus Aulacosphinctoides has been found in Somalia, northern India, Japan, Argentina, Mexico, New Zealand, and Madagascar.