The taxonomic status of Hylopsis platycephalus Werner, 1894 and Centrolenella Noble, 1920 (Amphibia: Anura)

On the assumption that the holotype of the South American frog Hylopsis platycephalus, described by Franz Werner in 1894, had been lost, Lynch (1981) designated a neotype, but in so doing incorrectly associated a centrolenid species with that name. As a result of the neotype designation, the genus Centrolenella Noble, 1920 (Centrolenidae) became a junior subjective synonym of Hylopsis Werner, 1894.
The holotype of Hylopsis platycephalus, which has never been lost, was obtained from the Institut fur Zoologie der Universität Wien and on examination was found to be a species of Sphaenorhynchus Tschudi, 1838 (Hylidae) distinct from other known members of the genus. Centrolenella Noble is thus validated and Hylopsis (ayn. nov.) becomes a junior subjective synonym of Sphaenorhynchus.
The rules of nomenclature relating to the neotype are discussed and Sphaenorhynchus platycephalus comb. nov. is redescribed. The centrolenid species which Lynch (1981) assigned to Hylopsis platycephalus is named Centrolenella savagei sp. nov.