Journal Article
Phylogeny and historical biogeography of neotropical catfishes Trichomycterus (Siluriformes: Trichomycteridae) from eastern Brazil
Vilardo, P.J., Katz, A.M. and Costa, W.J.E.M.
Record Number:
6242
Year:
2023
Journal:
Molecular Phylogenetics and Evolution
Pages:
1-10
Volume:
186 107836
Abstract:
The catfish subfamily Trichomycterinae is widely distributed in South America inhabiting several habitats, but
specially mountain streams. Trichomycterus is the most speciose trichomycterid genus and recently due to his
paraphyletic condition has been restricted to a clade from eastern Brazil called Trichomycterus sensu stricto
comprising around 80 valid species distributed in seven areas of endemism of eastern Brazil. This paper aims to
analyse the biogeographical events responsible for the distribution of Trichomycterus s.s., by reconstructing the
ancestral data based on a time-calibrated multigene phylogeny. A multi-gene phylogeny was generated using 61
species of Trichomycterus s.s. and 30 outgroups, with divergence events calculated based on the estimated origin
of Trichomycteridae. Two event-based analyses were applied to investigate the biogeographical events responsible
the present distribution of Trichomycterus s.s. and suggest that the modern distribution of the group is a
result of different vicariance and dispersal events. The diversification of Trichomycterus s.s. subgenera occurred in
the Miocene, except for Megacambeva, with different biogeographical events shaping its distribution in eastern
Brazil. An initial vicariant event split up the Fluminense ecoregion from the Northeastern Mata Atlantica +
Paraíba do Sul + Fluminense + Ribeira do Iguape + Upper Parana ecoregions. Dispersal events occurred mainly
between Paraíba do Sul and neighboring river basins, with additional dispersal events from Northeastern Mata
Atlantica to Paraíba do Sul, from Sao Francisco to Northeastern Mata Atlantica, and from Upper Parana to Sao
Francisco.
Times Cited:
3