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.

Aulacostephanidae Temporal range: Jurassic (Oxfordian-Tithonian),
Fossil shell of Rasenia cymodoce from Calvados (France), on display at Galerie de paléontologie et d'anatomie comparée in Paris
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Superfamily:	†Perisphinctoidea
Family:	†Aulacostephanidae Spath, 1924

Genera

Genera within this family include:

• Aulacostephanus
• Pictonia
• Rasenia
• Ringsteadia

References

• JOHN K. WRIGHT The Aulacostephanidae (Ammonoidea) of the Oxfordian/Kimmeridgian boundary beds (Upper Jurassic) of southern England
• Ammonites Archived 2021-05-14 at the Wayback Machine