The Metaniidae are family of freshwater sponges, with five genera and 25 species: \n* Acalle Gray, 1867 \n* Acalle recurvata (Bowerbank, 1863) \n* Corvomeyenia Weltner, 1913 \n* Corvomeyenia carolinensis Harrison, 1971 \n* Corvomeyenia epilithosa Volkmer-Ribeiro, Rosa-Barbosa & Machado, 2005 \n* Corvomeyenia everetti (Mills, 1884) \n* Corvomeyenia thumi (Traxler, 1895) \n* Drulia Gray, 1867 \n* Drulia batesii (Bowerbank, 1863) \n* Drulia brownii (Bowerbank, 1863) \n* Drulia conifera Bonetto & Ezcurra de Drago, 1973 \n* Drulia cristata (Weltner, 1895) \n* Drulia ctenosclera Volkmer & Mothes, 1981 \n* Drulia geayi (Gravier, 1899) \n* Drulia uruguayensis Bonetto & Ezcurra de Drago, 1969 \n* Houssayella Bonetto & Ezcurra de Drago, 1966 \n* Houssayella iguazuensis Bonetto & Ezcurra de Drago, 19