Aulacostephanidae is an extinct ammonoid cephalopod family belonging to the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived during the Upper Jurassic period, from the Oxfordian to Tithonian ages.
Genera Genera within this family include:Paleobiology DatabaseSepkoski Online Aulacostephanus Pictonia Rasenia Ringsteadia
References
JOHN K. WRIGHT The Aulacostephanidae (Ammonoidea) of the Oxfordian/Kimmeridgian boundary beds (Upper Jurassic) of southern England Ammonites