Rank Genus Subclass Ammonites | Superfamily Perisphinctaceae | |
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Aulacosphinctoides is an extinct ammonoid cephalopod that lived during the Late Jurassic (Late Kimmeridgian to early Tithonian), included in the ammonitid family Perisphinctidae.
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 tiplicate ribbing.
The genus Aulacosphinctoides has been found in Somalia, northern India, Japan, Argentina, Mexico, New Zealand, and Madagascar.
References
Aulacosphinctoides Wikipedia(Text) CC BY-SA