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Omalonyx unguis was previously known to occur in Argentina, Paraguay and Uruguay. We report the first conclusive record of occurrence of this species in Brazil, based on specimens collected in three localities in the Paraguay River sub-basin (Mato Grosso do Sul state – Campo Grande and Miranda; Mato Grosso state – Pocone), and in the Brazilian margin of the Parana River (Foz do Iguacu, Parana State). The species was identified by comparative morphology of the reproductive system, and a map that synthesizes the literature and reports new records is presented.

Mollusca, Gastropoda, Succineidae, Omalonyx unguis (d’Orbigny, 1835): distribution extension and new records for Brazil