Author: (Eigenmann, 1909)
Remark: Species redescribed by le Bail et al. (2000).
Comments: Lives in forest creeks where the water is clear and fast moving with medium sunny conditions, shallow depth (10-60 cm) and sandy-rocky substrate along with <i>Corydoras guianensis</i>, <i>Moenkhausia oligolepis</i> and <i>Phenacogaster cf. megalostictus</i>.  Like <i>R. cf. platyura</i>, mature males develop some odontodes on each side of the head as well as some odontodes elongated towards the back of the interorbitals (Ref. 35381).