Type locality: near the village of Cajari, northern Brazil.
The distribution appears limited to the upper Cajari River which merges with the Amazonas River. It was found in a very shallow channels and pools.
It is related to Rivulus igneus from Suriname and French Guiana.
This species has never been kept in captivity. Breeding & maintenance notes are based on general Rivulus behavior.
Males attempt to establish dominance over each other. It is considered a relatively easy species to propagate using floating and top mops. Eggs should be picked and placed in a small hatching container. Incubation runs about 14 days. Fry are large enough to accept newly hatched brine shrimp. It is reported that low pH results in a higher preponderance of males.