This freshwater fish is found in streams, in the southern Rio Amazonas basin. The largest specimens examined are from Brazil .
This is distingiushed by the irregular positioning of red dots on the flank of males, that is about half a pupil in diameter, and has a short pelvic fin, not surpassing urogenital papilla at the posterior. For females, the caudal fin has 5 to 8 dark grey to black bars and a rounded black spot smaller than eye. This species has 33 to 36 longitudinal series scales, 13 to 15 anal-fin rays, 28 to 31 caudal-fin rays.
Behavioural data for Melanorivulus Wallacei is currently being reviewed.
Diet information for Melanorivulus Wallacei is currently being compiled.
Reproduction data for Melanorivulus Wallacei is currently being compiled.
Freshwater; benthopelagic. Tropical South America: Brazil.
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