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The Quaternary in the state of Rio Grande do Sul ( RS ), southern Brazil, is geologically represented by the coastal plain and was originated by successive events of Pleistocene-Holocene marine transgressions and the occurrence of alluvial deposits. This paper aimed to characterize the fish assemblage occurring in a swampy Quaternary area adjacent to Lagoa Pequena, a lacustrine system connected to the west margin of the Laguna dos Patos estuary. A checklist is also provided of the ichthyofauna so far recorded in limnic systems of Quaternary deposits in the state of Rio Grande do Sul. A total of 42 species was recorded, distributed in nine orders, 18 families and 31 genera.   Characidae   and   Cichlidae   were the most representative families, comprising 15 and 4 species respectively. A bibliographic revision associated to our sample data revealed the occurrence of 156 species in limnic systems inserted in  RS  Quaternary deposits (114 limnic, 15 marine/estuarine/limnic, ten marine/estuarine, nine estuarine/limnic and eight marine).   Characiformes   and   Siluriformes   are the most diverse orders, corroborating the Neotropical pattern. Seven species can be considered endemic to  RS  Quaternary deposits.

The ichthyofauna of limnic systems in Quaternary deposits of extreme southern Brazil