• Cytaeis adherens Bouillon, Boero & Seghers, 1991
• Cytaeis atlantica (Steenstrup, 1837) accepted as Cytaeis tetrastyla Eschscholtz, 1829
• Cytaeis capitata Puce, Arillo, Cerrano, Romagnoli & Bavestrello, 2004
• Cytaeis exigua Haeckel, 1880 accepted as Hydractinia exigua (Haeckel, 1880) accepted as Podocoryna exigua (Haeckel, 1880)
• Cytaeis gracilis Mayer, 1900 accepted as Lizzia gracilis (Mayer, 1900)
• Cytaeis herdmani Browne, 1905 accepted as Cytaeis tetrastyla Eschscholtz, 1829
• Cytaeis imperialis Uchida, 1964
• Cytaeis indica (Stechow, 1920)
• Cytaeis japonica Uchida, 1927 accepted as Cytaeis imperialis Uchida, 1964
• Cytaeis kakinumae Namikawa & Deguchi, 2013
• Cytaeis macrogaster Haeckel, 1879 accepted as Cytaeis tetrastyla Eschscholtz, 1829
• Cytaeis minima Trinci, 1903 accepted as Podocorynoides minima (Trinci, 1903)
• Cytaeis nassa (Millard, 1959)
• Cytaeis nigritina Haeckel, 1879 accepted as Cytaeis tetrastyla Eschscholtz, 1829
• Cytaeis niotha (Pennycuik, 1959)
• Cytaeis nuda Rees, 1962
• Cytaeis octopunctata M. Sars, 1835 accepted as Rathkea octopunctata (M. Sars, 1835)
• Cytaeis polystyla Will, 1844 accepted as Turritopsis dohrnii (Weismann, 1883)
• Cytaeis propagulata (Bavestrello, 1987) accepted as Perarella propagulata Bavestrello, 1987
• Cytaeis pusilla Gegenbaur, 1857 (uncertain > taxon inquirendum)
• Cytaeis sagamiensis (Hirohito, 1988)
• Cytaeis schneideri (Motz-Kossowska, 1905) accepted as Perarella schneideri (Motz-Kossowska, 1905)
• Cytaeis tetrastyla Eschscholtz, 1829
• Cytaeis uchidae Rees, 1962
• Cytaeis vulgaris Agassiz & Mayer, 1899
• Nigritina atlantica Steenstrup, 1837 accepted as Cytaeis tetrastyla Eschscholtz, 1829
• Paracytaeis meteoris (Thiel, 1938)
• Paracytaeis octona Bouillon, 1978
• Perarella abyssicola (Haeckel, 1889) (uncertain > taxon inquirendum)
• Perarella affinis (Jäderholm, 1903) (uncertain > taxon inquirendum)
• Perarella clavata (Jäderholm, 1905)
• Perarella fallax (Broch, 1914)
• Perarella parastichopae Hirohito, 1988
• Perarella propagulata Bavestrello, 1987
• Perarella schneideri (Motz-Kossowska, 1905)
• Perarella spongicola (Haeckel, 1889) (uncertain > taxon inquirendum)
• Stylactella abyssicola Haeckel, 1889 accepted as Perarella abyssicola (Haeckel, 1889)
• Stylactella misakiensis Iwasa, 1934 accepted as Bouillonactinia misakiensis (Iwasa, 1934)
• Stylactella niotha Pennycuik, 1959 accepted as Cytaeis niotha (Pennycuik, 1959)
• Stylactella piscicola (Komai, 1932) accepted as Hydractinia piscicola (Komai, 1932)
• Stylactella siphonis Stechow, 1921 (uncertain > taxon inquirendum)
• Stylactella spongicola Haeckel, 1889 accepted as Perarella spongicola (Haeckel, 1889)
• Stylactella vermicola (Allman, 1888) (uncertain > taxon inquirendum)
• Stylactella yerii Iwasa, 1934 accepted as Hydractinia yerii (Iwasa, 1934)