†family Nystiellidae Clench and Turner 1952 (snail)
Gastropoda - Epitonioidea - Nystiellidae
Parent taxon: Epitonioidea according to P. Bouchet et al. 2005
See also Kaim 2004
Sister taxa: Epitoniidae, Janthinidae, Scalacea, Epitoniacea
Subtaxa: Opaliopsis Proscala
Ecology: epifaunal carnivore
Distribution:
• Miocene of Argentina (1 collection)
• Paleocene of New Zealand (2)
• Cretaceous of Germany (1), Madagascar (2), Poland (1), Spain (1), United States (1: Mississippi)
Total: 9 collections including 10 occurrences