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New remarkable sexually dimorphic miniature species of Hyphessobrycon (Characiformes: Characidae) from the upper Rio Tapajós basin
Author(s) -
Camelier P.,
Dagosta F. C. P.,
Marinho M. M. F.
Publication year - 2018
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.13579
Subject(s) - characidae , characiformes , biology , sexual dimorphism , tributary , fish fin , amazon basin , snout , zoology , anatomy , ecology , fishery , amazon rainforest , cartography , fish <actinopterygii> , geography
A new miniature species of Hyphessobrycon is described from an affluent of the Rio Papagaio, tributary of the Rio Juruena, upper Rio Tapajós basin, Mato Grosso State, Brazil. The new species can be distinguished from its congeners by having a remarkable secondary sexual dimorphism in its live colouration (males are red and females yellow), well‐defined and relatively narrow dark midlateral stripe extending from tip of snout to tip of middle caudal‐fin rays, absence of humeral blotch, 15–18 branched anal‐fin rays and five or six branched pelvic‐fin rays. The sexually dimorphic colouration of the new species is briefly discussed regarding its temporal variation.