Tethya is een geslacht van sponzen uit de klasse van de gewone sponzen (Demospongiae).
Soorten 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 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 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 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 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 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 papillosa (Thiele, 1905) Tethya paroxeata Sarà, Gómez & Sarà, 2001 Tethya parvistella (Baer, 1906) Tethya pellis Bergquist & Kelly-Borges, 1991 Tethya peracuata (Topsent, 1918) Tethya popae Bergquist & Kelly-Borges, 1991 Tethya pulchra Sarà, 1992 Tethya pulitzeri Sarà & Sarà, 2004 Tethya robusta (Bowerbank, 1873) Tethya rubra Samaai & Gibbons, 2005 Tethya rubra Ribeiro & Muricy, 2004 Tethya sarai Desqueyroux-Faúndez & van Soest, 1997 Tethya seychellensis (Wright, 1881) Tethya simi Sarà, Bavestrello & Calcinai, 2000 Tethya socius Sarà, Gómez & Sarà, 2001 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