Vol. 59, 2020
(update: 2020.10.13; 11.10)
Relationships and Description of a
New Species of Trichomycterus
(Siluriformes: Trichomycteridae) from the Rio Paraíba do Sul Basin, South-eastern Brazil
J. Vilardo1,*, Axel M. Katz1, and Wilson J. E. M.
of Systematics and Evolution of Teleost Fishes, Institute of Biology,
Federal University of Rio de Janeiro, Caixa Postal 68049, CEP
21941-971, Rio de Janeiro, Brazil. *Correspondence: E-mail:
E-mail: firstname.lastname@example.org (Costa); email@example.com (Katz)
Received 9 May 2020 / Accepted 20
Communicated by Felipe Ottoni
phylogenetic analysis using fragments of two nuclear and two
mitochondrial genes strongly supported sister group relationships
between a new species and Trichomycterus albinotatus,
corroborated by unique colour patterns of adult specimens and
juveniles, and morphology of the autopalatine bone. The new species is
distinguished from its closest congener, T. albinotatus, by details of the colouration and number of branchiostegal rays. Both the new species and T. albinotatus are endemic to the Rio Paraíba do Sul basin,
in the Atlantic Forest of south-eastern Brazil, but occur in distant
and disjunct areas. The new species, herein described, is endemic to
the upper section of the Rio Grande drainage, a right tributary of the
lower Rio Paraíba do Sul, an area situated in the Órgãos Mountain
Range. Trichomycterus albinotatus
is endemic to an area about 200 km across, in the upper section of the
Rio Preto that drains the Itatiaia Massif. However, both species are
only known from localities above 1100 m asl, suggesting that they
cannot survive in ecological conditions at lower altitudes. This study
indicates that efforts are necessary to provide more accurate data on
the species diversity and distribution of Trichomycterus in the biologically diverse and endangered Atlantic Forest of south-eastern Brazil.
Key words: Atlantic Forest,
Biodiversity, Catfish, Molecular phylogeny, Neotropics, Systematics.
Citation: Relationships and description of a new species of Trichomycterus (Siluriformes: Trichomycteridae) from the Rio Paraíba do Sul basin, south-eastern Brazil. Zool Stud 59:53. doi:10.6620/ZS.2020.59-53.
S1 | Table S2