Abstract
In rivers and other watercourses from San Juan Province specimens of Hatcheria macraei (Girard, 1855), Psalidodon eigenmanniorum (=Astyanax eigenmanniorum (Cope, 1894), Jenynsia lineata (Jenyns, 1842) and Trichomycterus corduvensis Weyenbergh 1877 were captured. Of these, H. macraei and P. eigenmanniorum were parasitized with the nematodes Rhabdochona acuminata and Contracaecum sp., respectively. The morphometric analysis of the identified nematodes is included. They are the first records of parasitic nematodes of fish from San Juan Province. In this way, the geographical distribution of both nematodes was extended and H. macraei and P. eigenmanniorum were registered as new hosts.
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