Family Megomphicidae Baker 1930 (slug)
Gastropoda - Stylommatophora - Megomphicidae
Parent taxon: Rhytidoidea according to E. L. Winterer and D. L. Durham 1962
Sister taxa: Acavidae, Dorcasiidae, Strophocheilidae
Subtaxa: Glyptostoma
Ecology: epifaunal
Distribution:
• Quaternary of United States (2: California collections)
• Pliocene of United States (2: California)
Total: 4 collections each including a single occurrence