Thubunaea acostai sp. nov. (Nematoda: Physalopteridae) from the lizard Liolaemus gracielae (Squamata: Iguania: Liolaemidae) in Argentina.

Thubunaea acostai sp. nov. is described and illustrated here, based on specimens found in the digestive tract of Liolaemus gracielae in the province of San Juan, Argentina. The new species differs from all other species assigned to Thubunaea by the number of caudal papillae. Thubunaea acostai sp. nov. has 30-31 papillae (12 pedunculated and 18-19 sessile), differing from other Neotropical species such as Thubunaea eleodori with 26 papillae (12 pedunculated and 14 sessile) and Thubunaea parkeri with 20 papillae, all pedunculated. The new species represents the third species for the Neotropics and the second described for Argentina.