Rhyacoglanis varii, new species

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Rhyacoglanis varii, new species

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Shibatta OA, Souza-Shibatta L. (2023). New species of Rhyacoglanis (Siluriformes: Pseudopimelodidae) from the upper rio Tocantins basin. Neotrop Ichthyol., 21(1):e220075. https://doi.org/10.1590/1982-0224-2022-0075
https://www.scielo.br/j/ni/a/TJm6NYzf7C9zb46ZFqQxrjJ/
Abstract
A new species of Rhyacoglanis from the upper rio Tocantins basin is described based on morphological and molecular data. The new species differs from the congeners by its color pattern, caudal fin shape, hypural bones fusion pattern, pectoral-fin spine shape, and barcode sequence of cytochrome oxidase subunit I (COI). In this study, two putative monophyletic groups of Rhyacoglanis are proposed based on morphology, one consisting of species with a short post-cleithral process and caudal fin with rounded lobes, Rhyacoglanis epiblepsis and R. rapppydanielae, and the other with a longer post-cleithral process and caudal fin with pointed lobes, R. annulatus, R. paranensis, R. pulcher, R. seminiger, and the new species described herein.
Keywords: Biodiversity; Bumblebee catfish; Ostariophysi; Systematics; Taxonomy
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FIGURE 1. Holotype of Rhyacoglanis varii, MZUEL 22317, 67.1 mm SL, rio do Peixe, upper rio Tocantins basin, Goianésia, state of Goiás, Brazil.
FIGURE 1. Holotype of Rhyacoglanis varii, MZUEL 22317, 67.1 mm SL, rio do Peixe, upper rio Tocantins basin, Goianésia, state of Goiás, Brazil.
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