A new glassfrog (Centrolenidae: Hyalinobatrachium) from the Topo River Basin, Amazonian slopes of the Andes of Ecuador

A new species of glassfrog (Centrolenidae) is described from the San Jacinto River, an affluent of the Topo River, on the Amazonian slopes of the Ecuadorian Andes. The new species, Hyalinobatrachium adespinosai sp. nov., can be differentiated from all other centrolenids by the combination of its coloration (transparent peritoneum and pericardium) and vocalization (call duration = 0.38-0.44 s, with 9-13 pulses per call; dominant frequency = 4,645-5,001 Hz). However, H. adespinosai sp. nov. is morphologically cryptic with H. anachoretus, H. esmeralda, and H. pellucidum, from which it differs by call traits (in H. anachoretus: call duration = 0.32-0.37 s, with 5 or 6 pulses per call, dominant frequency = 4,670-4,800 Hz; in H. esmeralda: call duration = 0.218-0.257 s, tonal call, dominant frequency = 4,739-5,580 Hz; in H. pellucidum: call duration = 0.112-0.140 s, tonal, dominant frequency = 5,000-5,710 Hz). Biogeographically, the new species is separated from H. anachoretus by a considerable distance and, also, the Maranon valley. Finally, following IUCN conservation criteria, the status of the new species is considered as Data Deficient.