The hylid tribe Sphaenorhynchini is composed of the single genus Sphaenorhynchus. A recent total evidence phylogenetic analysis of all the 15 currently described species of Sphaenorhynchus recovered S. pauloalvini as the earliest diverging taxon of this genus. Sphaenorhynchus pauloalvini is diagnosed by molecular evidence and several phenotypic characters that differentiate it from the remaining species of Sphaenorhynchus. On the basis of molecular evidence and an extensive list of phenotypic characters, we erect a new monotypic genus for S. pauloalvini and redefine the former Sphaenorhynchus to include the remaining species of this genus.

Hylid部落Sphaenorhynchini由单一属Sphaenorhynchus组成。最近对目前描述的所有15种Sphaenorhynchus物种进行的系统进化分析表明，回收的S. pauloalvini是该属的最早分化类群。Sphaenorhynchus pauloalvini通过分子证据，从剩余的物种区分开来几个表型特征，诊断Sphaenorhynchus。根据分子证据和广泛的表型特征，我们为pauloalvini设立了一个新的单型属，并重新定义了前Sphaenorhynchus，以包括该属的其余种。