The Haplosclerida are an order of demosponges. This order includes both freshwater and marine species. It contains the following suborders and families: \n* Suborder Haplosclerina \n* Family Callyspongiidae de Laubenfels, 1936 \n* Family Chalinidae Gray, 1867 \n* Family Niphatidae Van Soest, 1980 \n* Suborder Petrosina \n* Family Calcifibrospongiidae Hartman, 1979 \n* Family Petrosiidae Van Soest, 1980 \n* Family Phloeodictyidae Carter, 1882 \n* Suborder Spongillina \n* Family Lubomirskiidae Rezvoi, 1936 \n* Family Malawispongiidae Manconi & Pronzato, 2002 \n* Family Metaniidae Volkmer-Ribeiro, 1986 \n* Family Metschnikowiidae Czerniawsky, 1880 \n* Family Palaeospongillidae Volkmer-Ribeiro & Reitner, 1991 \n* Family Potamolepidae Brien, 1967 \n* Family Spongillidae Gray, 1867 \n* Family Sp