Metaniidae
 The Metaniidae are family of freshwater sponges with five genera and 25 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 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 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 vesparia (Martens 1868) Metania vesparioides (Annandale 1908)