A new species of Knodus (Characiformes: Characidae), with deep genetic divergence, from the Mearim and Munim river basins, Northeastern Brazil, and evidence for hidden diversity in adjacent river basins

A new species of Knodus (Characiformes: Characidae), with deep genetic divergence, from the Mearim and Munim river basins, Northeastern Brazil, and evidence for hidden diversity in adjacent river basins

Abstract A new species of Knodus from the Mearim and Munim River basins, Northeastern Brazil, is herein described based on integrative taxonomy, by using different molecular based species delimitation methods and independent approaches. The new species possesses the combination of character states t...

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Bibliographic Details
Published in:Neotropical ichthyology Vol. 20; no. 2
Main Authors: Aguiar, Rayane G., Guimarães, Erick C., Brito, Pâmella S. de, Santos, Jadson P., Katz, Axel M., Dias, Luiz Jorge B. da S., Carvalho-Costa, Luis Fernando, Ottoni, Felipe P.
Format: Journal Article
Language:English
Published: 2022
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Summary:Abstract A new species of Knodus from the Mearim and Munim River basins, Northeastern Brazil, is herein described based on integrative taxonomy, by using different molecular based species delimitation methods and independent approaches. The new species possesses the combination of character states that usually diagnoses the genus. The new species possesses a similar colour pattern to K. victoriae, which is also morphologically similar to it. The species described herein differs from K. victoriae by possessing more total vertebrae, more branched anal-fin rays, and fewer circumpeduncular scales. We also provide a detailed discussion of the morphological diagnostic features exhibited by Knodus species from adjacent river basins. Resumo Uma nova espécie de Knodus das bacias dos rios Mearim e Munim, Nordeste do Brasil, é descrita com base em taxonomia integrativa, utilizando diferentes métodos moleculares de delimitação de espécies e abordagens independentes. A nova espécie possui a combinação de estados de caráter que geralmente é utilizada para diagnosticar o gênero. A nova espécie possui um padrão de coloração semelhante a K. victoriae, que também é morfologicamente semelhante a ela. A espécie aqui descrita difere de K. victoriae por possuir mais vértebras totais, mais raios ramificados na nadadeira anal e menos escamas circumpedunculares. Nós também fornecemos uma discussão detalhada das características morfológicas diagnósticas exibidas por espécies de Knodus de bacias hidrográficas adjacentes.
ISSN:1679-6225
1982-0224
DOI:10.1590/1982-0224-2021-0173