Gastropoda - Epitonioidea - Epitoniidae
Parent taxon: Opalia according to J. W. Durham 1937
See also Durham 1944 and Todd 2001
Sister taxa: Opalia (Contemniscala), Opalia (Crassiscala), Opalia (Dentiscala), Opalia (Granuliscala), Opalia (Nodiscala), Opalia (Pliciscala), Opalia (Rugatiscala), Opalia atra, Opalia borealis, Opalia cavea, Opalia crenatoides, Opalia infrequens, Opalia mathewsonii, Opalia montereyensis, Opalia spongiosa, Opalia varicostata, Scala (Opalia) calvertensis, Scala (Opalia) prunicola, Scala (Opalia) reticulata
Subtaxa: Opalia (Opalia) bravinderi Opalia (Opalia) rugiferum Opalia (Opalia) wishkahensis
Ecology: slow-moving low-level epifaunal carnivore
Distribution:
• Pliocene of Jamaica (1 collection)
• Oligocene of United States (5: California, Washington)
• Paleocene of United States (1: Texas)
• Cretaceous of Mexico (1)
Total: 8 collections including 9 occurrences