Parent taxon: Hydrozoa according to B. M. Waggoner and M. R. Langer 1993
Sister taxa: Actinulida, Chondrophorina, Delheidia, Eoporpita, Fistulella, Graptogeitonia, Hydrocorallinae, Jillua, Lemniscaterina, Likinia, Lovcenipora, Milleporidae, Milleporina, Ovatoscutum, Plumalina, Rhizostromella, Roseoporella, Siphonophorida, Sphaeractinida, Spongiomorphida, Spriggia, Stoliczkaria, Stoliczkiella, Stylasterina, Trachylinida, Tubulariae
Subtaxa: Archaeoantennularia, Archaeocryptolaria, Archaeolafoea, Archaeonectris, Calyptoblastina, Cambrohydra, Clyxhydra, Crucimedusina, Discophyllum, Drevoella, Flexihydra, Inocaulis, Kristinella, Lafoeidae, Mazohydra, Mesokylix, Palaeacmea, Palaelophacmaea, Palaeokylix, Palaeonectris, Palaeotuba, Parleria, Philippinactinia, Plectodiscus, Pontifennia, Protohalecium, Protulophila, Psammactinia, Rhabdohydra, Sphenoecium, Thecata, Velubrella
Ecology: stationary epifaunal carnivore-suspension feeder