New species of driftwood catfish of Tatia (Siluriformes: Auchenipteridae) from rio Tapajós, Brazil

Abstract A new species of Tatia is described from rio Tapajós, upstream of the rapids of São Luiz do Tapajós, Pará State, Brazil. The new species is identified and diagnosed from its congeners through morphological characteristics such as the absence of an adipose fin, which is shared with T. akroa and T. britskii; the composition of the cranial roof elements; the color pattern consisting of dorsolateral dark dots formed by both dermal and epidermal pigments; as well as several morphometric measures. The new species is a Centromochlinae fish that feeds on insects on the surface of the water at night and it is probably endemic to rio Tapajós basin.

摘要：本研究记述了采自巴西帕拉州圣路易斯塔帕若斯急流上游塔帕若斯河的塔蒂亚鲶属（Tatia）新种。该新种可通过多项形态特征与同属物种区分：无脂鳍（该特征与T. akroa及T. britskii共有）、颅顶骨片组成、由真皮与表皮色素共同形成的背侧深色斑点体色模式，以及多项形态测量参数。该新种隶属于中鳍鲶亚科（Centromochlinae），夜间以水体表面的昆虫为食，大概率为塔帕若斯河流域特有物种。