Three-hundred and forty-nine specimens of Spauligodon loboi n. sp. (Nematoda, Pharyngodonidae) were found in the large intestines of 55 of 225 adult specimens representing 5 species of Liolaemus collected in 11 localities of northwestern Argentina. Prevalence of infection was 24% (mean intensity = 6.3 ± 3.4, range = 2–28). Spauligodon loboi n. sp. differs from other neotropical species in that the filamentous portion of the tail of males is spiny, whereas that of females is smooth. A key to the species of Spauligodon in the Neotropical Realm is provided.

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