Costa, W. J. E. M. & H. Lazzarotto, 2008
Rivulus amanan, a new killifish from the Japurá river drainage, Amazonas river basin, Brazil (Cyprinodontiformes: Rivulidae)Abstract
Rivulus amanan, new species, from the Amanã lake drainage, Amazonas river basin, Brazil, is described. It was found in shallow places of lentic aquatic biotopes at igarapé do Baré floodplains, within the Amazon forest. The new species is a member of the subgenus Anablepsoides, which also includes R. atratus and R. ornatus. It differs from both by the unique color pattern of the caudal fin in males, in which the dorsal portion of the fin is orangish red, the middle black with light blue to greenish blue stripe, and the ventral dark red to black posteriorly, and by having frontal squamation F-patterned. It also differs from the other species of Anablepsoides by a combination of pelvic fin reaching between urogenital papilla and base of second anal-fin ray in males, 10-12 anal-fin rays, venter light gray with dark gray dots, and mandibular series of neuromasts not interrupted, with six neuromasts. It is considered to be more closely related to R. ornatus by both having the caudal fin with three zones distinctively colored in males.
Costa, Wilson J. E. M. and Henrique Lazzarotto
Ichthyol. Explor. Freshwaters, Vol. 19, No. 2, pp. 129-134, 2008