Vocalizações de Hypsiboas beckeri e H. stenocephalus (Anura: Hylidae), duas espécies do grupo de H. polytaenius do sudeste do Brasil
The analysis of anuran vocalizations is an important taxonomic tool, especially within complexes of morphologically similar species. Hypsiboas beckeri and H. stenocephalus are syntopic in their type locality (Poços de Caldas, state of Minas Gerais, Brazil), and both belong to the H. polytaenius species group. Analyzed calls of these species showed that a previous acoustic description for H. beckeri, from another locality, probably represents a distinct species. The calls of topotypical H. beckeri and H. stenocephalus differed substantially from each other, and also could be differentiated from other species of the H. polytaenius group. Additionally, we present the first record of H. beckeri for the State of São Paulo. The conservation status of both studied species varies among the available red lists and should thus be revisited in the future according to new taxonomic and distributional information.