In this study two species of soft ticks belonging to the genus Ornithodoros were recorded in three areas in the province of Corrientes, Argentina. Four larvae were identified as Ornithodoros hasei (Schulze, 1935) on Molossus molossus (Molossidae) in Paraje Tres Cerros (Department of San Martín), while 56 larvae were identified as Ornithodoros sp. cf. O. mimon Kohls, Clifford & Jones, 1969 on Eptesicus furinalis and Myotis levis (Vespertilionidae) in Paraje Galarza (Department of Santo Tomé) and Colonia Carlos Pellegrini (Department of San Martín). These last two locations are found within the Esteros del Iberá eco-region. The known distribution range of O. hasei and O. cf. O. mimon is expanded to include the province of Corrientes. Two new ectoparasite-host associations were recorded for Argentina between O. hasei on M. molossus and O. cf. O. mimon on M. levis. The morphological differences together with the results of the phylogenetic analysis show that O. hasei presents genetic similarity with specimens from Brazil, and in Argentina, with ticks from Santa Fe. Instead, Ornithodoros sp. cf. O. mimon recorded in Corrientes and Uruguay belong to a different taxon than the O. mimon recorded in Brazil and Santa Fe, Argentina. Based on this, O. mimon should be considered a complex of species in which the specimens from Corrientes are provisionally considered as Ornithodoros sp. cf. O. mimon until their taxonomic status can be determined.
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