Family Helicinidae Férussac 1822 (snail)
Gastropoda - Cycloneritida - Helicinidae
Synonym: Olygyridae Gray 1847
Parent taxon: Helicinoidea according to P. Bouchet et al. 2005
See also Beesley 1998, Gingerich 1987 and Kosnik 2002
Sister taxa: Dawsonellidae, Deianiridae, Neritiliidae, Proserpinellidae, Proserpinidae
Subtaxa: Ceratodiscinae Dimorphoptychiinae Helicininae Hendersoniinae Stoastomatinae Vianinae
Type: Helicininae
Ecology: epifaunal
Distribution:
• Quaternary of United States (4: Michigan, Texas, Virginia collections)
• Miocene of Austria (5), Germany (1), Hungary (1), United States (1: Montana)
• Oligocene to Miocene of United States (5: Florida, Montana)
• Eocene of France (3), United States (1: California)
Total: 21 collections including 22 occurrences