Melanorivulus paresi (Costa 2008)

Distinguished from all other species of the subgenus Melanorivulus in having small white spots forming a reticulate pattern on the dorsal fin and the basal part of the anal fin, and forming narrow bars on the caudal fin in males, and a narrow basihyal, width about 35% of the basihyal length. Can be diagnosed from all congeners by the unique combination of the following characters: entire flank with a continuous mid-lateral dark gray stripe; scales in longitudinal series 30-31; flank with close red dots, arranged in chevron-like series with the vertex on the mid-lateral line; and caudal fin in males with red bars (Ref. 76975).

Dorsal soft rays (total): 8 - 10; Analsoft rays: 12 - 14; Vertebrae: 29 - 30

Found in a shallow (about 10 cm deep), slightly inclined swamp with slow water current, in open vegetation area (Ref. 76975).