Hymeniacidon

Hymeniacidon is a genus of sea sponges in the class Demospongiae. Some members of the genus are known to be mobile, achieving speeds of between 1 and 4 mm per day.

==Species== The following species are recognised in the genus Hymeniacidon: Hymeniacidon actites (Ristau, 1978) Hymeniacidon addreissiformis Dickinson, 1945 Hymeniacidon agminata Ridley, 1884 Hymeniacidon assimilis Levinsen, 1887 Hymeniacidon atlantica Burton, 1948 Hymeniacidon burtoni Van Soest & Hooper, 2020 Hymeniacidon caerula Pulitzer-Finali, 1986 Hymeniacidon calcifera Row, 1911 Hymeniacidon calva (Ridley, 1881) Hymeniacidon centrotyla Hentschel, 1914 Hymeniacidon chloris de Laubenfels, 1950 Hymeniacidon conica (Kirk, 1909) Hymeniacidon corticata (Thiele, 1905) Hymeniacidon digitata (Hansen, 1885) Hymeniacidon dubia Burton, 1932 Hymeniacidon dystacta de Laubenfels, 1954 Hymeniacidon fallax Bowerbank, 1886 Hymeniacidon fasciculata (Fristedt, 1887) Hymeniacidon fernandezi Thiele, 1905 Hymeniacidon flaccida Pulitzer-Finali, 1996 Hymeniacidon flavia Sim & Lee, 2003 Hymeniacidon fristedti (Topsent, 1913) Hymeniacidon glabrata Burton, 1954 Hymeniacidon gracilis (Hentschel, 1912) Hymeniacidon halichondroides (Thiele, 1898) Hymeniacidon heliophila Parker, 1910 Hymeniacidon hentscheli Fernandez, Bravo-Gómez, Cárdenas & Hajdu, 2020 Hymeniacidon iberica (Ferrer-Hernandez, 1914) Hymeniacidon informis (Burton, 1913) Hymeniacidon insutus Koltun, 1964 Hymeniacidon kerguelensis Hentschel, 1914 Hymeniacidon kitchingi (Burton, 1935) Hymeniacidon longistylus Desqueyroux, 1972 Hymeniacidon luxurians (Lieberkuhn, 1859) Hymeniacidon mixta (Sara, 1958) Hymeniacidon ovalae Tanita & Hoshino, 1989 Hymeniacidon perlevis (Montagu, 1818) crumb-of-bread sponge Hymeniacidon petrosioides Dendy, 1905 Hymeniacidon plumigera Bowerbank, 1874 Hymeniacidon proteus (Ridley, 1884) Hymeniacidon racemosa Brondsted, 1924 Hymeniacidon reptans (Cuartas, 1991) Hymeniacidon rigida Dendy, 1897 Hymeniacidon rubiginosa Thiele, 1905 Hymeniacidon rugosa (Schmidt, 1868) Hymeniacidon simplex (Bowerbank, 1866) Hymeniacidon simplicima (Bowerbank, 1874) Hymeniacidon sinapium Laubenfels, 1930 Hymeniacidon sphaerodigitata Bergquist, 1970 Hymeniacidon stylifera (Stephens, 1915) Hymeniacidon sublittoralis Samaai & Gibbons, 2005 Hymeniacidon timonovi (Rezvoi, 1931) Hymeniacidon torquata Topsent, 1916 Hymeniacidon ungodon de Laubenfels, 1932 Hymeniacidon upaonassu Fortunato, Pérez & Lôbo-Hajdu, 2020 Hymeniacidon variospiculata Dendy, 1922 Hymeniacidon zosterae Row, 1911