The gastrointestinal tract of 20 Argentine black and white tegu Salvator merianae, was examined in search of nematodes. The diaphanocephalid nematode Diaphanocephalus galeatus was identified with a prevalence of 80%. This work contributes to the knowledge of the host's helminth diversity, being the first record in southern Brazil, and presents unpublished photographic records of the species.
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