Tethyidae Gray, 1867
Alcyonium papillosum Lamarck, 1815
Alcyonium putridosum Lamarck, 1815
Alcyonium testudinarium Lamarck, 1815
Tethya actinia de Laubenfels, 1950
Tethya acuta Sarà & Sarà, 2004
Tethya amplexa Bergquist & Kelly-Borges, 1991
Tethya andamanensis Dendy & Burton, 1926
Tethya asbestella Lamarck, 1815
Tethya aurantium (Pallas, 1766)
Tethya beatrizae Ribeiro & Muricy, 2011
Tethya bergquistae Hooper & Wiedenmayer, 1994
Tethya boeroi Sarà, 1992
Tethya brasiliana Ribeiro & Muricy, 2004
Tethya bullae Bergquist & Kelly-Borges, 1991
Tethya burtoni Sarà & Sarà, 2004
Tethya californiana de Laubenfels, 1932
Tethya citrina Sarà & Melone, 1965
Tethya coccinea Bergquist & Kelly-Borges, 1991
Tethya communis Bergquist & Kelly-Borges, 1991
Tethya comorensis Sarà, Corriero & Bavestrello, 1993
Tethya compacta Bergquist, 1961
Tethya cyanae Ribeiro & Muricy, 2004
Tethya cyaneae Ribeiro & Muricy, 2004
Tethya deformis Thiele, 1898
Tethya dendyi Sarà & Sarà, 2004
Tethya densa Sarà, 1992
Tethya diploderma Schmidt, 1870
Tethya ensis Sarà, Gómez & Sarà, 2001
Tethya expansa Sarà & Sarà, 2004
Tethya fastigata Bergquist & Kelly-Borges, 1991
Tethya fastigiata Bergquist & Kelly-Borges, 1991
Tethya fissurata Lendenfeld, 1888
Tethya flexuosa Sarà & Sarà, 2004
Tethya gigantea (Lendenfeld, 1888)
Tethya globostellata Lendenfeld, 1897
Tethya globum Duchassaing & Michelotti, 1864
Tethya gracilis Sarà, Sarà, Nickel & Brümmer, 2001
Tethya gunni Sarà & Sarà, 2004
Tethya hibernica Heim, Nickel, Picton & Brümmer, 2007
Tethya hooperi Sarà & Sarà, 2004
Tethya ignis Ribeiro & Muricy, 2004
Tethya ingalli Bowerbank, 1858
Tethya irregularis Sarà & Bavestrello, 1998
Tethya japonica Sollas, 1888
Tethya laevis (Lendenfeld, 1888)
Tethya levii Sarà, 1988
Tethya leysae Heim & Nickel, 2010
Tethya magna Kirkpatrick, 1903
Tethya maza Selenka, 1879
Tethya mexicana Sarà, Gómez & Sarà, 2001
Tethya microstella Sarà, 1990
Tethya minuta Sarà, Sarà, Nickel & Brümmer, 2001
Tethya monstrosa (Burton, 1924)
Tethya mortoni Bergquist & Kelly-Borges, 1991
Tethya multifida (Carter, 1882)
Tethya multistella Lendenfeld, 1888
Tethya nicolae Ribeiro & Muricy, 2011
Tethya norvegica Bowerbank, 1872
Tethya novaecaledoniae Sarà, 1988
Tethya nux (Selenka, 1867)
Tethya omanensis Sarà & Bavestrello, 1995
Tethya ornata Sarà, Bavestrello & Calcinai, 2000
Tethya orphei Sarà, 1990
Tethya ovum Sarà, Gómez & Sarà, 2001
Tethya oxyaster (Burton, 1934)
Tethya papillosa (Thiele, 1905)
Tethya paroxeata Sarà, Gómez & Sarà, 2001
Tethya parvistella (Baer, 1906)
Tethya parvula Ribeiro & Muricy, 2011
Tethya pellis Bergquist & Kelly-Borges, 1991
Tethya peracuata (Topsent, 1918)
Tethya phillipensis Lendenfeld, 1888
Tethya popae Bergquist & Kelly-Borges, 1991
Tethya popeae Bergquist & Kelley-Borges, 1991
Tethya pulchra Sarà, 1992
Tethya pulitzeri Sarà & Sarà, 2004
Tethya robusta (Bowerbank, 1873)
Tethya rubra Samaai & Gibbons, 2005
Tethya sarai Desqueyroux-Faúndez & van Soest, 1997
Tethya seychellensis (Wright, 1881)
Tethya simi Sarà, Bavestrello & Calcinai, 2000
Tethya simillima Bowerbank, 1873
Tethya socius Sarà, Gómez & Sarà, 2001
Tethya solangae Ribeiro & Muricy, 2011
Tethya sollasi Bergquist & Kelly-Borges, 1991
Tethya songakensis Kim & Sim, 2005
Tethya stellagrandis (Dendy, 1916)
Tethya stellodermis Sarà & Sarà, 2004
Tethya stolonifera Bergquist & Kelly-Borges, 1991
Tethya strongylata Sarà, Bavestrello & Calcinai, 2000
Tethya taboga (de Laubenfels, 1936)
Tethya tasmaniae Sarà & Sarà, 2004
Tethya tenuisclera Sarà & Corriero, 1994
Tethya topsenti Sarà, Bavestrello & Calcinai, 2000
Tethya uljinensis Shim & Sim, 2008
Tethya varians Sarà & Bavestrello, 1998
Tethya viridis (Baer, 1906)
Tethya wilhelma Sarà, Sarà, Nickel & Brümmer, 2001
Tethyorrhaphis gigantea Lendenfeld, 1888
Tethyorrhaphis tuberculata Lendenfeld, 1888