Aulacostephanidae

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:
 * Aulacostephanus
 * Pictonia
 * Rasenia
 * Ringsteadia