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Psammocambeva    exhibits the largest geographical distribution amongst the subgenera of    Trichomycterus    s.s. , with its present northernmost represented by    Trichomycterus   tete   , endemic to the upper Rio de Contas Basin in the Chapada Diamantina Region, north-eastern Brazil. Herein, we describe a new species recently collected in the Chapada Diamantina Region, but in the Rio Paraguaçu Basin, about 100 km north of the area inhabited by    T.   tete   . A molecular phylogeny using one nuclear and two mitochondrial genes (2430 bp) supported the new species as sister to    T.   tete   ; both species are distinguished by colour patterns, morphometric data, relative position of dorsal and anal fins and osteological character states. The clade comprising the new species and    T.   tete   , endemic to the semi-arid Caatinga biogeographical province, is supported as sister to a clade comprising species from the Rio Doce and Rio Paraíba do Sul Basins, in the Atlantic Forest biogeographical province. This study corroborated the Chapada Diamantina Region, a well-known mountainous biodiversity centre, as an important centre of endemism for trichomycterid catfishes.

zoosystematics and evolution

Relationships and description of a new catfish species from Chapada Diamantina, the northernmost record of    Trichomycterus    s.s.  (  Siluriformes  ,   Trichomycteridae  )