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Neotropical Ichthyology, 6(3):419-424, 2008 Copyright 2008 Sociedade Brasileira de Ictiologia

Summary: 419
Neotropical Ichthyology, 6(3):419-424, 2008
Copyright © 2008 Sociedade Brasileira de Ictiologia
A new species of Hemiancistrus from the rio Araguaia basin, Goiás state,
Lesley S. de Souza1
, Marcelo R. S. Melo1
, Carine C. Chamon2
and Jonathan W. Armbruster1
Hemiancistrus cerrado is described from the tributaries of rio Araguaia, rio Tocantins basin. Hemiancistrus cerrado has
external similarities with H. megalopteryx and H. punctulatus from coastal streams of southern Brazil, and can be distinguished
by having a larger internarial width, 15.9-21.1% of head length (vs. 11.2-14.0% in H. megalopteryx and 11.2-13.9% in H.
punctulatus) and, with little overlap, by the larger adipose-fin spine length, 9.4-13.6% of standard length (vs. 7.1-8.7% in H.
megalopteryx and 7.4-10.0% in H. punctulatus). Hemiancistrus cerrado further differs from H. megalopteryx by having the
pectoral-fin spine reaching maximally to the middle of the pelvic-fin spine when adpressed in adult males (vs. reaching tip).
Hemiancistrus cerrado differs from other members of Hemiancistrus by color and numerous morphometric and meristic data.
Hemiancistrus cerrado é descrito de tributários da margem esquerda do rio Araguaia, bacia do rio Tocantins. Hemiancistrus
cerrado possui similaridades externas com H. megalopteryx e H. punctulatus de drenagens costeiras do sul do Brasil, e pode
ser separado das duas espécies pela maior distância entre as narinas, 15.9-21.1% do comprimento da cabeça (vs. 11.2-14.0% em
H. megalopteryx e 11.2-13.9% em H. punctulatus), e, com alguma sobreposição, pela maior nadadeira adiposa, 9.4-13.6% do


Source: Armbruster, Jonathan W. - Department of Biological Sciences, Auburn University


Collections: Environmental Sciences and Ecology