A new species of Hemigrammus (Characiformes: Characidae) from western Amazon River basin,Colombia |
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Authors: | Juan G Albornoz-Garzón Alejandro Méndez-López Carlos DoNascimiento Flávio C T Lima |
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Institution: | 1. Colecciones Biológicas, Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, Boyacá, Colombia;2. Museu de Zoologia da Universidade Estadual de Campinas “Adão José Cardoso”, São Paulo, Brazil |
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Abstract: | A new species of Hemigrammus is described from the Amazon Basin near Leticia, Departamento Amazonas, Colombia. In common with some congeners and some Hyphessobrycon spp., the new species colour pattern lacks a humeral blotch but has a caudal-peduncle blotch. It can be distinguished from congeners with a similar colour pattern by having: a relatively deep body (30.2%–39.0% LS), 20–24 branched anal-fin rays, 6–8 perforated scales of the lateral line, anal-fin base without a conspicuous black stripe, 3–5 maxillary teeth, maxillary teeth with 1–3 cusps, a thin longitudinal midlateral line and a well-defined oval shaped caudal blotch, extending from caudal peduncle into the lower caudal-fin rays. Comparisons with congeners and with Hyphessobrycon species sharing the same general colour pattern are presented. |
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Keywords: | freshwater fishes Hemigrammus tridens group Río Amazonas Stethaprioninae taxonomy |
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