Suborder Thecata Fleming 1828
Parent taxon: Hydroida according to P. D. Taylor 1988
Sister taxa: Archaeonectris, Calyptoblastina, Cambrohydra, Chondrophorina, Clyxhydra, Drevotella, Flexihydra, Gymnoblastina, Inocaulis, Lafoeidae, Mazohydra, Palaeacmea, Palaeonectris, Parleria, Pontifennia, Psammactinia, Rhabdohydra
Subtaxa: Eisenackiella
Ecology: stationary epifaunal carnivore-suspension feeder
Distribution: found only at Thanet, Kent (Cretaceous of the United Kingdom)