Clade Basommatophora Keferstein 1864
Parent taxon: Pulmonata according to P. Bouchet et al. 2005
See also Gordillo 1991, Kaim 2004, Sepkoski 2002, Shoshani et al. 1989 and Todd 2001
Sister taxa: Akteophila, Basommatophora, Bernicia, Ceriidae, Discidae, Petrophila
Subtaxa: Amphiboloidea Patellopsis Pleurolimnaea Pseudohercynella Ptychogyra Siphonarioidea Vasculum