Parent taxon: Opisthobranchia according to J. J., Jr. Sepkoski 2002
Sister taxa: Acanthotrophia, Acochlidea, Buscotypus, Canepina, Cephalaspidea, Cylindrobullinoidea, Floribella, Gymnosomata, Heteroptygmatis, Heterostrophia, Lutima, Mariottia, Mistostigma, Nicosiaella, Notaspidea, Paronaella, Pseudofusia, Reticulacella, Rhodopemorpha, Scorbinidola, Tectibranchia, Thecosomata, Umbraculomorpha
Subtaxa: none
Ecology: epifaunal
Distribution:
• Quaternary of Australia (3 collections), French Polynesia (1), Japan (2)
• Miocene of Argentina (4), Brazil (3), Indonesia (3), New Zealand (1), Puerto Rico (1), South Africa (1)
• Oligocene to Miocene of Argentina (1)
• Oligocene of New Zealand (1), United States (1: Mississippi)
• Eocene of Australia (2), France (1), Mexico (1), New Zealand (7), United States (8: Alabama, California, Mississippi, Oregon, Texas)
• Paleocene to Eocene of Australia (1)
• Paleocene of Argentina (6), Australia (2), Greenland (1), New Zealand (7)
• Cretaceous of Argentina (1), Austria (1), Egypt (7), France (3), Hungary (1), Mexico (2), Spain (1), Switzerland (2), United States (8: California, Texas)
• Jurassic of France (1), India (3), Israel (2), Italy (1), Madagascar (1), Poland (2), Portugal (5), Romania (1), Tunisia (9), the United Kingdom (7), United States (1: Wyoming)
Total: 117 collections including 135 occurrences