Alcyonidium is een geslacht van mosdiertjes uit de  familie van de Alcyonidiidae.

Soorten 
 Alcyonidium adustum Winston & Hayward, 2012
 Alcyonidium albescens Winston & Key, 1999
 Alcyonidium albidum Alder, 1857
 Alcyonidium androsovae d'Hondt, 1983
 Alcyonidium anglei d'Hondt & Goyffon, 1991
 Alcyonidium antarcticum Waters, 1904
 Alcyonidium argyllaceum Castric-Fey, 1971
 Alcyonidium australe d'Hondt & Moyano, 1979
 Alcyonidium candidum Ryland, 1963
 Alcyonidium capronae Winston & Hakansson, 1986
 Alcyonidium cellarioides Calvet, 1900
 Alcyonidium chondroides O'Donoghue & de Watteville, 1937
 Alcyonidium columbianum O'Donoghue & O'Donoghue, 1926
 Alcyonidium condylocinereum Porter, 2004 = Grijze zeevinger
 Alcyonidium diaphanum (Hudson, 1778) = Bruine zeevinger
 Alcyonidium disciforme Smitt, 1872
 Alcyonidium duplex Prouho, 1892
 Alcyonidium effusum Norman, 1909
 Alcyonidium eightsi Winston & Hayward, 1994
 Alcyonidium enteromorpha Soule, 1951
 Alcyonidium epispiculum Porter & Hayward, 2004
 Alcyonidium erectum Silén, 1942
 Alcyonidium excavatum Hincks, 1880
 Alcyonidium exiguum Vieira, Migotto & Winston, 2014
 Alcyonidium flabelliforme Kirkpatrick, 1902
 Alcyonidium flustroides Busk, 1886
 Alcyonidium foliaceum Silén, 1942
 Alcyonidium gelatinosum (Linnaeus, 1761) = Doorschijnende zeevinger
 Alcyonidium hauffi Marcus, 1939
 Alcyonidium hirsutum (Fleming, 1828) = Ruwe zeevinger
 Alcyonidium hydrocoalitum Porter, 2004 = Penneschaft-mosdiertje
 Alcyonidium irregulare Kluge, 1962
 Alcyonidium kermadecense Gordon, 1984
 Alcyonidium lutosum Winston & Hayward, 2012
 Alcyonidium maculosum Winston & Hayward, 2012
 Alcyonidium mamillatum Alder, 1857 = Bultige zeevinger
 Alcyonidium multigemmatum Gordon, 1986
 Alcyonidium nanum Silén, 1942
 Alcyonidium nipponicum d'Hondt & Mawatari, 1986
 Alcyonidium nodosum O'Donoghue & de Watteville, 1944
 Alcyonidium nostoch (A.P.de Candolle) Lamouroux, 1813
 Alcyonidium pachydermatum Denisenko, 1996
 Alcyonidium papillatum O'Donoghue, 1924
 Alcyonidium parasiticum (Fleming, 1828) = Overwoekerend mosdiertje
 Alcyonidium pedunculatum Robertson, 1902
 Alcyonidium pelagosphaerum Porter & Hayward, 2004
 Alcyonidium polyoum (Hassall, 1841) = Wierzeevinger
 Alcyonidium polypylum Marcus, 1941
 Alcyonidium proboscideum Kluge, 1962
 Alcyonidium protoseideum
 Alcyonidium pseudodisciforme Denisenko, 2009
 Alcyonidium pulvinatum Vieira, Migotto & Winston, 2014
 Alcyonidium radicellatum Kluge, 1946
 Alcyonidium rhomboidale O'Donoghue, 1924
 Alcyonidium rylandi d'Hondt & Goyffon, 2005
 Alcyonidium sagamianum Mawatari, 1953
 Alcyonidium sanguineum Cook, 1985
 Alcyonidium scolecoideum Porter & Hayward, 2004
 Alcyonidium shizuoi d'Hondt & Mawatari, 1986
 Alcyonidium simulatum Porter & Hayward, 2004
 Alcyonidium torpedo d'Hondt, 2006
 Alcyonidium torquatum Vieira, Migotto & Winston, 2014
 Alcyonidium variegatum Prouho, 1892
 Alcyonidium vermiculare Okada, 1925
 Alcyonidium verrilli Osburn, 1912
 Alcyonidium vicarians d'Hondt & Chimenz Gusso, 2006
 Alcyonidium vitreum Vieira, Migotto & Winston, 2014

Alcyonidiidae