Tethya

Tethya is a genus of sea sponges belonging to the family Tethyidae. Members of this genus all have a spherical body form and some are known to be able to move at speeds of between 1 and 4 mm per day.

Species
The following species are recognised in the genus Tethya:
 * 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, 1994
 * Tethya bitylastra Mácola & Menegola, 2018
 * 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 irisae Sorokin, Ekins, Yang & Cárdenas, 2019
 * Tethya irregularis Sarà & Bavestrello, 1998
 * Tethya japonica Sollas, 1888
 * Tethya laevis (Lendenfeld, 1888)
 * Tethya levii Sarà, 1988
 * Tethya leysae Heim & Nickel, 2010
 * †Tethya logani Dawson, 1857
 * Tethya magna Kirkpatrick, 1903
 * Tethya maza Selenka, 1879
 * Tethya melinka Hajdu, Desqueyroux-Faúndez, Carvalho, Lôbo-Hajdu & Willenz, 2013
 * Tethya meloni Corriero, Gadaleta & Bavestrello, 2015
 * 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 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 popae Bergquist & Kelly-Borges, 1991
 * Tethya pulchra Sarà, 1992
 * Tethya pulitzeri Sarà & Sarà, 2004
 * Tethya robusta (Bowerbank, 1873)
 * Tethya rubra Samaai & Gibbons, 2005
 * Tethya samaaii Ribeiro & Muricy, 2011
 * Tethya sarai Desqueyroux-Faúndez & van Soest, 1997
 * Tethya seychellensis (Wright, 1881)
 * Tethya simi Sarà, Bavestrello & Calcinai, 2000
 * Tethya socius Sarà, Gómez & Sarà, 2001
 * Tethya solangeae 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 vacua Austin, Ott, Reiswig, Romagosa & McDaniel, 2014
 * Tethya varians Sarà & Bavestrello, 1998
 * Tethya viridis (Baer, 1906)
 * Tethya wilhelma Sarà, Sarà, Nickel & Brümmer, 2001