Redescription of the advertisement calls of Scinax tigrinus and S. maracaya (Anura: Hylidae) with an evaluation of their differential diagnosis

Résumé

Tree-frogs of the genus Scinax comprises the richest group within Hylinae. In this paper we seek to contribute to the taxonomy of S. maracaya and S. tigrinus re-describing their advertisement call and trying to provide an acoustic diagnosis for them. Scinax tigrinus calls had duration of 213 ms with around 9 pulses per call; calls emitted at 62/min; pulses duration of 13 ms with intervals of 9 ms and a rate of 46/sec; frequency peak at 3.13 kHz. Scinax maracaya calls had duration of 306 ms with around 13 pulses per call; calls emitted at 49/min; pulses duration of 15 ms with intervals of 8 ms and a rate of 42/sec; frequency peak at 2.99 kHz. Our data on S. tigrinus are in agreement to those from the literature extending its distribution of 200 km southward. Described calls of S. maracaya differed from ours in frequency and pulse duration what we attribute to different technologies used for records and analyzes. Calls had no diagnostic feature between species but were significantly different in duration and pulses number. Scinax tigrinus and S. maracaya represents another instance where frogs species can be differentiated morphologically but are relatively acoustically conserved.