†order Trachylinida
Parent taxon: Hydrozoa according to J. J., Jr. 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, Stylasterina, Tubulariae, Tubuloparietes
Subtaxa: Acsaspedites Hydrocsaspedota Narcomedusina
Ecology: passively mobile nektonic carnivore
Distribution: there are no occurrences of Trachylinida in the database