Redescription of Astyanax guianensis Eigenmann 1909 (Characiformes: Characidae), a poorly known and widespread fish from the Amazon, Orinoco and Guiana Shield drainages.
نویسندگان
چکیده
Astyanax guianensis is redescribed based on the holotype, paratypes, and additional specimens from the rio Essequibo in Guyana, rio Orinoco in Venezuela and from several localities in the Amazon river basin in Brazil, Colombia and Bolivia. Astyanax guianensis is diagnosed by having five to 10 maxillary teeth, 31 to 35 pored lateral-line scales, 21 to 25 branched anal-fin rays, and a dark vertical humeral blotch followed by a clear area and then by a dark longitudinal stripe, ending before the caudal-fin rays. In addition, comments on the importance of revisionary studies on the species of the Characidae are provided.
منابع مشابه
Chromosome polymorphism of heterochromatin and nucleolar regions in two populations of the fish Astyanax bockmanni (Teleostei: Characiformes)
The family Characidae, order Characiformes, is one of the most numerous and diverse families of freshwater fishes in South America (Nelson, 2006), consisting of approximately 597 recognized species (Buckup et al., 2007). The genus Astyanax, a speciose group of Neotropical characids, comprises about 86 valid species (Lima et al., 2003) that occur in diverse habitats within freshwater drainages f...
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The fish genus Astyanax is widespread throughout the Neotropical region and is one of the most species-rich genera of the Characiformes. Cytogenetic studies of Astyanax have revealed marked intra- and interspecific diversity, with the identification of various species complexes. In this report, we describe the karyotypic structure of two sympatric species of Astyanax (Astyanax sp. and Astyanax ...
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ورودعنوان ژورنال:
- Zootaxa
دوره 3931 4 شماره
صفحات -
تاریخ انتشار 2015