Papers/Abstracts

A new species of Hemigrammus Gill 1858 (Characiformes: Characidae) from the western Amazon basin in Peru and Colombia

Flávio C.T. Lima, Vanessa Correa and Rafaela P. Ota

aqua International Journal of Ichthyology,  pp. 123-132, Volume 22 issue 3, 15 July 2016

Keywords

Hemigrammus ocellifer species-group, Hemigrammus aguaruna, Río Marañon, Rio Amazonas, Hemigrammus falsus.

Abstract

Hemigrammus aguaruna, new species, is described from tributaries of the Río Maranõn, Departamento Loreto, Peru, and is also recorded from Leticia, Departamento Amazonas, Colombia. The new species belongs to the Hemigrammus
ocellifer species group, sharing with the remaining species of the group the presence of two humeral blotches, a caudal peduncle blotch, the upper margin of the eye red
in living specimens, and the presence in adult males of a single midlle-sized hook on the last unbranched and anteriormost branched anal-fin rays. Hemigrammus aguaruna can be readily distinguished from the remaining congeners of the Hemigrammus ocellifer species group, with exception of H. yinyang, by presenting a very conspicuous, intensely dark, roughly oval, horizontally elongated second blotch
(vs. second humeral blotch less developed than the first humeral blotch, vertically elongated and very narrow). Comments on the recent revalidation of Hemigrammus falsus are presented.

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