Family Hygromiidae Tryon 1866 (slug)
PaleoDB taxon number: 113645
Parent taxon: Helicoidea according to P. Bouchet et al. 2005
Sister taxa: Elonidae, Helicidae, Helicodontidae, Pleurodontidae, Trissexodontidae
Subtaxa: Caracollina, Helicopsis, Leucochroopsis, Monachainae
Ecology: epifaunal