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1 Acta Parasitologica

1 2013

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Falcaustra sanjuanensis sp. nov. (Nematoda: Kathlaniidae) from Odontophrynus cf. barrioi (Anura: Cycloramphidae) from Argentina

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Gonzalez C. E. , Sanabria E. A. , Quiroga L. B.

nr 1

Here, we describe a new kathlaniid nematode, Falcaustra sanjuanensis sp. nov., from the large intestine of Odontophrynus cf. barrioi (Anura: Cycloramphidae), from San Juan Province, Argentina. The new species belongs to the Falcaustra group that possesses a pseudosucker. It resembles F. andrias in the distribution pattern of caudal papillae (six precloacal, four adcloacal, 12 postcloacal, one unpaired median anterior to the cloaca) but differs from F. andrias in the following characters: the longer size of males and females (11.17–13.45 mm and 10.1–15.5 mm, respectively); the longer size and form of the gubernaculum (0.17–0.23 mm, triangular form); the arrangement of postcloacal papillae (three pairs on the ventral side, two pairs on the lateral side, one pair on the subventral side) and unpaired papilla anterior to the cloaca located on the protuberance. The species description is based on light microscopy and scanning electron microscopy (SEM). Falcaustra sanjuanensis sp. nov. represents the 12th Neotropical species assigned to the genus. Also, we added a key to Neotropical species of Falcaustra.