Zanata Angela Maria, Oliveira Claudio, Oliveira-Silva Leonardo
Programa de Pós-Graduação em Biodiversidade e Evolução, Instituto de Biologia, Universidade Federal da Bahia, Salvador, Brazil.
Departamento de Biologia Estrutural e Funcional, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, Brazil.
J Fish Biol. 2024 Dec;105(6):1929-1938. doi: 10.1111/jfb.15938. Epub 2024 Sep 22.
A new species of Characidium shared by adjacent tributaries of the upper portions of the Tapajós and Xingu river basins is described. Characidium varii, new species, can be distinguished from the congeners by having distinctly speckled pattern of colouration, including dark blotches on cheek and ventral surface of head, by having conspicuous dark marks on fins, along with a single row of dentary teeth, isthmus completely covered by scales, 14 circumpeduncular scales, and swimbladder reduced. Molecular data reinforce the validation of the new species. The distribution of C. varii supports the hypothesis of the existence of a faunistic mixing between Tapajós and Xingu river basins, corresponding to the region of the Serra do Cachimbo and surrounding areas, previously proposed in the literature.
描述了一种分布于塔帕若斯河和欣古河上游相邻支流的新脂鲤属物种。新物种瓦氏脂鲤（Characidium varii）可通过以下特征与同属其他物种区分开来：具有明显的斑点状体色，包括脸颊和头部腹面有深色斑点，鳍上有明显的深色斑纹，同时具有单列齿骨齿，峡部完全被鳞片覆盖，有14枚尾柄鳞，以及鳔退化。分子数据进一步证实了该新物种的有效性。瓦氏脂鲤的分布支持了塔帕若斯河和欣古河流域之间存在动物区系混合的假说，这与文献中先前提出的卡欣布山脉及周边地区的情况相符。
