Rosana de Mesquita Alves

• Biodiversity Journal, 11 (4): 0807-0814

  Rosana de Mesquita Alves, Igor Henrique Rodrigues Oliveira, Rubens Pasa & Karine Frehner Kavalco
  A new species of genus Psalidodon Eigenmann, 1911 related to the P.  paranae complex (Characiformes Characidae) from Upper Paranaíba river basin, Brazil, supported by genetic and morphometric data
  https://doi.org/10.31396/Biodiv.Jour.2020.11.4.807.814
  https://www.zoobank.org/References/d67e864a-1fd4-4641-9d8d-bbada5bbfd2d

  ABSTRACT
  The genus Psalidodon Eigenmann, 1911 (Characiformes Characidae) is a fish group with great diversity, expressed at the chromosomal, genetic and taxonomic level. The genus is marked by events of allopatric and vicariant evolution, by the formation of complexes of species and by wide geographical distribution. Both in these fish and other organisms, the association of studies with molecular markers and geometric morphometric techniques are useful in delimiting significantly evolutionary units (ESU). In this work, we performed maximum likelihood estimates (MLE) from mitochondrial Cyt b gene sequences and canonical variables (CVA) from 13 landmarks in eight populations of P. aff. paranae Eigenmann, 1914. The analysis of Maximum likelihood resulted in the structuring of populations in two different clades, one of which was composed only of individuals from a small population inhabiting a stream with approximately two km of length, demonstrating their clear distinction from the other populations. The analysis of canonical variation demonstrated the complete structuring of this population, and the position of each clade in the morpho-space was congruent with the topography observed in the MLE. Based on the results found, the existence of a new endemic species of the genus Psalidodon is evident.

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