Parent taxon: Allogastropoda according to S. Schubert et al. 2008
Sister taxa: Ampezzanildidae, Heterodiscohelix, Levihelix, Xylodisculidae
Subtaxa: Anoptychiidae Gordenellidae Mathildidae Schartiidae Tofanellidae Trachoecidae
Ecology: epifaunal
Distribution:
• Quaternary of Argentina (1 collection), Costa Rica (2), Italy (2)
• Pliocene of India (1), Indonesia (2), Italy (1), Jamaica (3), Trinidad and Tobago (1)
• Miocene to Pliocene of Japan (1)
• Miocene of Algeria (1), Austria (1), France (2), Germany (4), Indonesia (2), Italy (2), the Netherlands (1), New Zealand (2), Panama (1), Poland (1), Trinidad and Tobago (1), United States (3: Florida)
• Oligocene of Denmark (1), the Netherlands (1), United States (5: Mississippi)
• Eocene of Antarctica (3), France (4), Germany (1), Italy (1), New Zealand (3), Peru (3), Spain (1), Tonga (1), the United Kingdom (6), United States (92: Alabama, Louisiana, Maryland, Mississippi, Oregon, South Carolina, Texas)
• Paleocene of Australia (1), Austria (2), Belgium (1), Denmark (6), France (1), Greenland (3), New Zealand (1), Poland (2), United States (19: Alabama, Alaska, Illinois, Maryland, Texas)
• Cretaceous of Australia (1), France (3), Germany (2), Israel (1), Japan (1), Madagascar (2), Mexico (2), Poland (36), the Russian Federation (2), South Africa (1), the United Kingdom (4), United States (70: Alabama, Arkansas, California, Delaware, Georgia, Kansas, Maryland, Mississippi, New Jersey, North Carolina, South Carolina, Tennessee, Texas)
• Jurassic of France (6), Germany (97), Hungary (6), India (5), Italy (9), Kenya (1), Luxembourg (1), Madagascar (1), Peru (1), Poland (46), Portugal (1), the Russian Federation (2), Spain (1), Switzerland (4), Tanzania (3), Turkey (2), the United Kingdom (3)
• Triassic of Austria (2), China (15), Germany (1), Hungary (6), Indonesia (7), Iran (3), Italy (48), Mexico (1), Peru (20), Singapore (1), Slovakia (3), Slovenia (1), Svalbard and Jan Mayen (6), the United Kingdom (3), United States (4: Alaska, Idaho, Oregon, Utah)
• Permian of Bosnia and Herzegovina (1), the Russian Federation (1)
• Carboniferous of United States (1: Texas)
Total: 631 collections including 1136 occurrences