Parent taxon: Hydrozoa according to J.E.N. Veron 2000
See also Sepkoski 2002
Sister taxa: Actinulida, Delheidia, Fistulella, Graptogeitonia, Hydrocorallinae, Hydroida, Kerunia, Lemniscaterina, Likinia, Limnomedusae, Milleporidae, Milleporina, Narcomedusae, Nigriporellidae, Plumalina, Rhizostromella, Roseoporella, Siphonophorida, Sphaeractinida, Spongiomorphida, Stoliczkiella, Trachylinida, Tubulariae, Tubuloparietes
Subtaxa: Calyptopora Crypthelia Distichopora Inferiolabiata Lepidopora Stenohelia Stylaster Stylasteridae
Ecology: stationary epifaunal carnivore-suspension feeder
Distribution:
• Quaternary of Costa Rica (1 collection), Vanuatu (1)
• Mangapanian of New Zealand (2)
• Pliocene of New Zealand (3)
• Miocene of New Zealand (5), Spain (1)
• Oligocene of New Zealand (1), United States (2: Washington)
• Eocene of Antarctica (1), New Zealand (1), Tonga (1), United States (2: Washington)
• Paleocene of Denmark (1), France (1)
• Cretaceous of Australia (1)
Total: 24 collections including 39 occurrences