Bivalve superfamilies

Cyamioidea is a superfamily of bivalve mollusks in the superorder of Imparidentia. It was described by Sars in 1878. There is currently no widespread consensus as to which taxa belong in Cyamioidea, but it currently contains the families of Cyamiidae, Gaimardiidae, and Sportellidae. The group is suspected to be polyphyletic.

Carditoidea is a superfamily of marine bivalve clams.

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.