Class Hydrozoa Owen 1843
PaleoDB taxon number: 4596
Parent taxon: Medusozoa according to E. Kayal et al. 2013
Sister taxa: Coronatae, Cubozoa
Subtaxa: Actinulida, Chondrophorina, Delheidia, Fistulella, Graptogeitonia, Hydrocorallinae, Hydroida, Kerunia, Lemniscaterina, Likinia, Limnomedusae, Milleporidae, Milleporina, Plumalina, Rhizostromella, Roseoporella, Siphonophorida, Sphaeractinida, Spongiomorphida, Stoliczkaria, Stoliczkiella, Stylasterina, Trachylinida, Tubulariae, Tubuloparietes
Ecology: stationary epifaunal carnivore-suspension feeder