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Reappraisal of the systematics of <i>Microglanis cottoides</i> (Siluriformes, Pseudopimelodidae), a catfish from southern Brazil

By Lenice Souza-Shibatta (5485007), João F. R. Tonini (5485016), Vitor P. Abrahão (5485013), Lucas R. Jarduli (5485010), Claudio Oliveira (105510), Luiz R. Malabarba (3316029), Silvia H. Sofia (5021114) and Oscar A. Shibatta (5485004)


<div><p>The southern region of Brazil is characterized by high species diversity and endemism of freshwater fishes distributed across geographically isolated river basins. <i>Microglanis cottoides</i> has a widespread range across these river basins and occurs in sympatry with other endemic species of the genus (e.g. <i>M</i>. <i>cibelae</i>, <i>M</i>. <i>eurystoma</i>, and <i>M</i>. <i>malabarbai</i>). Herein we tested the monophyly of <i>M</i>. <i>cottoides</i> and presented for the first time information about the molecular phylogeny of species in the genus. The results suggest that <i>M</i>. <i>cottoides</i> currently forms a non-monophyletic group which includes populations endemic to the Uruguay River basin that are more closely related to <i>M</i>. <i>malabarbai</i>, and excludes <i>M</i>. <i>cibelae</i>, found to be nested within <i>M</i>. <i>cottoides</i>. Based on an integrative approach using morphological and molecular data, we propose <i>M</i>. <i>cibelae</i> as a junior synonym of <i>M</i>. <i>cottoides</i>, and the populations of the Uruguay River basin previously assigned to <i>M</i>. <i>cottoides</i> in fact belong to <i>M</i>. <i>malabarbai</i>. Our molecular phylogeny shows that <i>M</i>. <i>cottoides</i> is sister to <i>M</i>. <i>parahybae</i>, which is also a coastal species, and <i>M</i>. <i>malabarbai</i> is sister of <i>M</i>. <i>garavelloi</i>, both endemic to inland river basins. The time-calibrated phylogeny indicates that the separation between inland and the coastal clades occurred in the Tertiary period, and that the species within the coastal basins diverged in the Pliocene, which overlaps with the diversification times estimated for the two inland species as well. This pattern of diversification corroborates some previous studies with other fishes from the same region.</p></div

Topics: Evolutionary Biology, Ecology, Inorganic Chemistry, Environmental Sciences not elsewhere classified, Biological Sciences not elsewhere classified, malabarbai, species, Uruguay River basin, river basins, Microglanis cottoides, cibelae, phylogeny
Year: 2018
DOI identifier: 10.1371/journal.pone.0199963
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Provided by: FigShare
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