Parent taxon: Hydrozoa according to G. D. Stanley and B. Senowbari-Daryan 1999
See also Stanley 1986
Sister taxa: Actinulida, Delheidia, Fistulella, Graptogeitonia, Hydrocorallinae, Hydroida, Hydroidolina, Kerunia, Lemniscaterina, Likinia, Limnomedusae, Milleporidae, Milleporina, Narcomedusae, Nigriporellidae, Plumalina, Rhizostromella, Roseoporella, Siphonophorida, Sphaeractinida, Stoliczkiella, Stylasterina, Trachylinida, Tubulariae, Tubuloparietes
Subtaxa: Jillua Spongiomorphidae
Ecology: stationary epifaunal carnivore-suspension feeder
Distribution:
• Eocene of Mexico (1 collection)
• Cretaceous of France (1), Germany (6)
• Jurassic to Cretaceous of Japan (6)
• Jurassic of Austria (1), Canada (1: British Columbia), China (2), Croatia (1), Indonesia (1), Morocco (3), Romania (1)
• Triassic of Austria (5), Bosnia and Herzegovina (1), Canada (3: British Columbia, Yukon), Hungary (2), Indian Ocean (1), Indonesia (1), Iran (5), Italy (1), Japan (3), Malaysia (1), Oman (1), Romania (2), Slovenia (3), Spain (1), Tajikistan (1), Thailand (1), Timor-Leste (1), the United Arab Emirates (1), United States (43: Alaska, California, Idaho, Nevada, Oregon)
• Permian of China (1)
Total: 102 collections including 123 occurrences