Costa, Wilson J. E. M., 2007
Rivulus kayabi, a new killifish from the Tapajós river basin, southern Brazilian Amazon (Cyprinodontiformes: Rivulidae)Abstract
Rivulus kayabi, new species, from the Arinos and Teles Pires drainages of the Tapajós river basin, central Brazil, is described. It is similar to other species of Melanorivulus from southern Amazonian tributaries of central Brazil by having a unique color pattern of flank, consisting of red marks arranged in a chevron-like pattern with vertex
on the ventral portion of the flank. It differs from all other species of this region by a combination of 31-33 scales in the longitudinal series, a horizontal series of white spots on the dorsal portion of the caudal fin in females, 13 pectoral-fin rays, and 28-31 caudal-fin rays.
Costa, Wilson J. E. M.
Ichthyological Exploration of Freshwaters 18(4), 345–350, 2007