Suborder Euthecosomata (snail)
Parent taxon: Pteropoda according to P. Bouchet et al. 2017
See also Eames 1952 and Squires 1989
Sister taxa: Gymnosomata, Pseudothecosomata
Subtaxa: Spiratellidae
Ecology: epifaunal
Distribution:
• Miocene of Azerbaijan (2 collections), France (1)
• Oligocene of the Netherlands (1)
• Eocene of New Zealand (2), Pakistan (1), the United Kingdom (3), United States (1: Alabama)
• Paleocene of Australia (2)
Total: 13 collections including 16 occurrences