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Issue: Vol. 4347 No. 1: 10 Nov. 2017
Type: Article
Published: 2017-11-10
DOI: 10.11646/zootaxa.4347.1.9
Page range: 151–168
Abstract views: 73
PDF downloaded: 1

Description of two new species of Lithoxus (Hypostominae: Loricariidae) from rio Jari and rio Amapá basins, Brazilian Guiana Shield

Universidade Estadual Paulista, Departamento de Morfologia, Laboratório de Biologia e Genética de Peixes, Prof. Dr. Antônio Celso Wagner Zanin, 250, Rubião Júnior, 18618–689, Botucatu, São Paulo State, Brazil.
Museum d’histoire naturelle, Département d’herpétologie et d’ichtyologie, route de Malagnou 1, case postale 6434, CH-1211 Genève 6, Switzerland.
Universidade Estadual Paulista, Departamento de Morfologia, Laboratório de Biologia e Genética de Peixes, Prof. Dr. Antônio Celso Wagner Zanin, 250, Rubião Júnior, 18618–689, Botucatu, São Paulo State, Brazil.
Universidade Estadual Paulista, Departamento de Morfologia, Laboratório de Biologia e Genética de Peixes, Prof. Dr. Antônio Celso Wagner Zanin, 250, Rubião Júnior, 18618–689, Botucatu, São Paulo State, Brazil.
Pisces COI gene DNA barcode Guiana Shield Amapá State Neotropical fish

Abstract

Two new species of Lithoxus, a genus diagnosed by possessing a dorsoventrally depressed body, a large round oral disk, and small tooth cusps with few teeth, are described from two drainages of the Guiana Shield: Lithoxus jariensis from the rio Jari basin and L. raso from the rio Raso, rio Amapá basin. The new species, L. jariensis, is distinguished from congeners by having an adipose fin, by the number of branched anal-fin and caudal-fin rays, by color pattern of the body, number of teeth, adipose-fin length, dorsal adipose-caudal distance, caudal peduncle depth, cleithral width, and dorsal-anal distance. Lithoxus raso can be diagnosed from congeners by coloration pattern, by having an adipose fin, by the number of branched anal-fin rays, number of teeth, adipose-fin length, dorsal adipose–caudal distance, caudal peduncle depth, and cleithral width. Greater genetic divergence in mitochondrial cytochrome oxidase subunit I (COI) confirms L. jariensis and L. raso as two new species.

 

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