Metaniidae

Metaniidae is a family of freshwater sponges, with five genera and 27 species:
 * Acalle Gray, 1867
 * Acalle recurvata (Bowerbank, 1863)
 * Corvomeyenia Weltner, 1913
 * Corvomeyenia carolinensis Harrison, 1971
 * Corvomeyenia epilithosa Volkmer-Ribeiro, Rosa-Barbosa & Machado, 2005
 * Corvomeyenia everetti (Mills, 1884)
 * Corvomeyenia thumi (Traxler, 1895)
 * Drulia Gray, 1867
 * Drulia batesii (Bowerbank, 1863)
 * Drulia brownii (Bowerbank, 1863)
 * Drulia conifera Bonetto & Ezcurra de Drago, 1973
 * Drulia cristata (Weltner, 1895)
 * Drulia cristinae Volkmer-Ribeiro, Drago, Machado & Sabaj, 2017
 * Drulia ctenosclera Volkmer & Mothes, 1981
 * Drulia geayi (Gravier, 1899)
 * Drulia uruguayensis Bonetto & Ezcurra de Drago, 1969
 * Houssayella Bonetto & Ezcurra de Drago, 1966
 * Houssayella iguazuensis Bonetto & Ezcurra de Drago, 1966
 * Metania Gray, 1867
 * Metania fittkaui Volkmer-Ribeiro, 1979
 * Metania godeauxi (Brien, 1968)
 * Metania kiliani Volkmer-Ribeiro & Costa, 1992
 * Metania madagascariensis Manconi & Pronzato, 2015
 * Metania melloleitaoi Machado, 1948
 * Metania ovogemata Stanisic, 1979
 * Metania pottsi (Weltner, 1895)
 * Metania reticulata (Bowerbank, 1863)
 * Metania rhodesiana Burton, 1938
 * Metania spinata (Carter, 1881)
 * Metania subtilis Volkmer, 1979
 * Metania vesparioides (Annandale, 1908)
 * Metania vesparium (Martens, 1868)