Aglaophenia octodonta (Heller, 1868)
Aglaophenia picardi Svoboda, 1979
Bicaularia tongensis (Stechow, 1919)
Bimeria vestita Wright, 1859
Campanularia hincksii Alder, 1856
Chlorohydra viridissima (Pallas, 1766) accepted as Hydra viridissima Pallas, 1766
Clytia gracilis (M. Sars, 1851)
Clytia hemisphaerica (Linnaeus, 1767)
Clytia linearis (Thorneley, 1900)
Dynamena quadridentata (Ellis & Solander, 1786)
Eudendrium carneum Clarke, 1882
Eudendrium merulum Watson, 1985
Eudendrium racemosum (Cavolini, 1785)
Filellum serratum (Clarke, 1879)
Halopteris diaphana (Heller, 1868)
Hydra viridissima Pallas, 1766
Lafoeina tenuis Sars, 1874 (uncertain > taxon inquirendum )
Obelia dichotoma (Linnaeus, 1758)
Pennaria disticha Goldfuss, 1820
Sertularia marginata (Kirchenpauer, 1864) accepted as Tridentata marginata (Kirchenpauer, 1864)
Sertularia tongensis (Stechow, 1919) accepted as Bicaularia tongensis (Stechow, 1919)
Tridentata marginata (Kirchenpauer, 1864)