Order Acochlidea Odhner 1939 (snail)
Gastropoda - Opisthobranchiata
Parent taxon: Opisthobranchia according to P. L. Beesley 1998
Sister taxa: Acanthotrophia, Akeridae, Buscotypus, Canepina, Cephalaspida, Cephalaspidea, Cylindrobullinoidea, Floribella, Gymnosomata, Heteroptygmatis, Heterostrophia, Lutima, Mariottia, Mistostigma, Nicosiaella, Notaspidea, Paronaella, Pseudofusia, Reticulacella, Rhodopemorpha, Scorbinidola, Tectibranchia, Thecosomata, Umbraculomorpha
Subtaxa: Acochlidioidea Microhedyloidea
Ecology: epifaunal