Abstract
Cosmocercoides latrans n. sp. (Cosmocercidae) from the small intestine of Leptodactylus latrans (Anura: Leptodactylidae) from Northeastern Province of Buenos Aires, Argentina is described. The new species can be distinguished from their congeners by a combination of the characters, among which stands out the number of rosette papillae, the lack of gubernaculum and the presence of lateral alae in both sexes. There are over 20 species in the genus Cosmocercoides, and Cosmocercoides latrans n. sp. represents the third species from the Neotropical realm and the second for Argentina. Additionally, seven previously known taxa are reported; Pseudoacanthocephalus cf. lutzi, Catadiscus uruguayensis, Rauschiella palmipedis, Aplectana hylambatis, Cosmocerca parva, Schrankiana sp. and Rhabdias elegans; providing literature records and information on distribution and host-parasite relationships.
Highlights
Previous reports of endoparasites in Leptodactylus latrans (Steffen, 1815) have been summarized in checklists from South America (Campião et al 2014, Fernandes & Kohn 2014) and Argentina (González & Hamann 2015)
The criolla frog, as it is commonly known, inhabits flooded fields and temporary or permanent shallow ponds and is common to find in periurban places and crops
The systematic determination of the helminths was carried out following specific keys (Yamaguti 1961, 1963, Petrochenko 1971a, b, Anderson et al 1974, Gibson et al 2002, Jones et al 2005, Bray et al 2008) and drawings were made with the aid of a drawing tube
Summary
Previous reports of endoparasites in Leptodactylus latrans (Steffen, 1815) have been summarized in checklists from South America (Campião et al 2014, Fernandes & Kohn 2014) and Argentina (González & Hamann 2015). These reports, mainly as isolated records of a taxonomic nature, include several species of acanthocephalans, digeneans, cestodes and nematodes parasitizing this large frog species. Among nematodes, is frequent to find specimens belonging to Cosmocercidae Members of this family are parasites of the digestive tract of amphibians and reptiles. It includes the Subfamily Cosmocercinae Railliet, 1916 that contains 9 genera: Cosmocerca Diesing, 1861, Aplectana Railliet & Henry, 1916, Oxysomatium Railliet & Henry, 1916, Cosmocercella Steiner, 1924, Raillietnema Travassos, 1927, Oxyascaris Travassos, 1920, Cosmocercoides Wilkie, 1930 Paradollfusnema
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