Alcyonidiidae
- Alcyonidium albidum Alder, 1857
- Alcyonidium anderssoni Abrikossov, 1932
- Alcyonidium diaphanum (Farre, 1837)
- Alcyonidium disciforme Smitt, 1872
- Alcyonidium erectum Andersson, 1902
- Alcyonidium excavatum Hincks, 1880
- Alcyonidium gelatinosum (Linnaeus, 1767)
- Alcyonidium hirsutum (Fleming, 1828)
- Alcyonidium irregulare Kluge, 1962
- Alcyonidium mamillatum Alder,1857
- Alcyonidium mytili Dalyell, 1847
- Alcyonidium pachydermatum Kluge, 1962
- Alcyonidium parasiticum (Fleming, 1828)
- Alcyonidium proboscideum Kluge, 1962
- Alcyonidium radicellatum Kluge, 1946
- Alcyonidium vermiculare Okada, 1925