Genus Oscarella Vosmaer, 1884

Type species: Halisarca lobularis Schmidt, 1862 (by monotypy). ( Oscaria) Vosmaer, 1881: 163 (preocc. by Oscaria Gray, 1873 —Reptilia); Oscarella Vosmaer, 1884: pl. 8 (explanation); 1887: 326 (nom. nov. for Oscaria Vosmaer). Octavella Tuzet and Paris, 1963: 88 .

Diagnosis: Homoscleromorphorida without skeleton, with a variable development of the ectosome. The aquiferous system has a sylleibid-like organization, with spherical to ovoid eurypylous or diplodal choanocyte chambers arranged around large exhalant canals (Muricy & Diaz 2002).