Corvomeyenia epilithosa sp. nov. is described and registered for a protected area at southern Brazil. An updating of Manconi & Pronzato's (2002) definition and distribution of genus Corvomeyenia Weltner, 1913 is presented altogether with a taxonomic key for the four species in the genus: C. everetti (Mills, 1884) and C. carolinensis Harrison (1971), from the Neartic Region, C. thumi (Traxler, l895) and C. epilithosa sp. nov. from the Neotropical Region. Remarkable habitat distinctions exhibited by these species are commented.
Demospongiae; Freswhater sponges; Neartic-Neotropical Regions
