Alternative name Melanorivulus rossoi.

On March 30, 2004, A. Rosso discovered the species in Estado de
Mato Grosso do Sul: Município de Campo Grande: stream at the road BR-060, 21.5 km SW from Campo Grande, rio Inhanduí drainage, rio Paraná basin, Brasil at about 20°40’S - 54°40’W, and a altitude about 500 m above sea level.

The species is described in the same paper together with 6 other taxa of the Rivulus genus. These are: Rivulus scalaris, R. cyanopterus, R. dapazi, R. litteratus, R. rutilicaudus and R. egens, all members of the Rivulus punctatus group.

The describer Dr. W. Costa honored the discoverer by naming the fish Rivulus rossoi.

No records are available for the breeding of this species but this will not differ very much with the way other small Rivulus from the R. punctatus group breed.

Remarks :

First of all, life animals are needed for further study of this new species.

Max. size 5.0 cm.
Dorsal 8.5,
Anal 13.5,
D/A 10.5,
LL scale count (average)31.5
Pre- dorsal length to % SL – 78.7 %
Depth to % SL – 19.1 %