The internal buccal morphology of the tadpoles of Eupemphix nattereri, Physalaemus albonotatus, P. centralis, P. cuvieri, Leptodactylus furnarius, L. fuscus, L. petersii and L. podicipinus are described and compared using scanning electron microscopy. The tadpole of E. nattereri has major differences when compared to other tadpoles of the Physalaemus genus. The tadpoles of P. albonotatus, P. centralis and P. cuvieri present similarities in internal buccal morphology, such as the number of the infralabial and lateral ridge papillae, but P. centralis differ in the number of the post-narial and buccal roof arena papillae. Among the tadpoles of the Leptodactylus species is possible to observe patterns, in distribution and quantity of the internal buccal structures (infralabial and lingual papillae, buccal floor and roof arena papillae, median ridge, lateral ridge papillae and postnarial papillae) in the species groups. The characteristics of the internal buccal morphology may be useful when used together with other data helping in comprehension of the systematic of the order Anura.
internal buccal anatomy; description; tadpole; Leiuperidae; Leptodactylidae
