Carditida

Carditida is an order of marine bivalve clams.

Astartoidea is a superfamily of bivalves in the order Carditida. In the World Register of Marine Species (WoRMS), it is considered a junior synonym of Crassatelloidea, whereas in ITIS Crassatelloidea is a separate superfamily containing Crassatellidae.

Crassatelloidea is a superfamily of bivalves in the order Carditida. In the World Register of Marine Species (WoRMS), Astartoidea is considered a junior synonym of Crassatelloidea, whereas in ITIS Astartoidea is a separate family containing Astartidae and Cardiniidae – Cardiniidae itself being classified instead in Carditoidea by WoRMS.