Tadpole of Scinax onca sp. n. from the middle Purus-Madeira Interfluve (lot INPA-H 35411). Specimen collected at kilometre 350 of the BR-319 highway, municipality of Beruri, State of Amazonas, Brazil. From top to bottom: dorsal, ventral, and lateral views of preserved tadpole in developmental Stage 37. Scale bar 5 mm.