Stumpffia

The genus Stumpffia was proposed to be a junior synonym of Rhombophryne in 2016,^[6] but this proposal was disputed and reversed by authors of a subsequent study, on the basis of their reciprocal monophyly and consistent morphological differences between the two genera that allow them to be distinguished.^[7] The latter study established a new genus, Anilany for "Stumpffia" helenae, a species that would otherwise have rendered Stumpffia paraphyletic, and which is morphologically and genetically highly distinct from any species of Rhombophryne or Stumpffia.^[7]

This debate was continued in 2017, with one group of authors continuing to advocate for synonymy of these two genera plus Anilany,^[8] while the other group of authors continued to advocate for separate treatment of these genera based on their monophyly and morphological distinction allowing them to be distinguished with comparative ease.^[9] There was a temporary impasse, wherein the Amphibian Species of the World database continued to adopt the single-genus taxonomy, and as a result, so too did the IUCN Red List of Endangered Species and other online databases (e.g. iNaturalist) that draw from that resource. Meanwhile, AmphibiaWeb continued to use the three-genus taxonomy, as did the taxonomists working on cophyline systematics,^[2][10][11] and other groups working more broadly on frog evolution and taxonomy.^[12][13]

In March 2019, a new genus, Mini, was described for the miniaturised frogs previously confused with Stumpffia that are more closely related to Plethodontohyla.^[14] Evidence in this study, as well as that presented in a paper by Na Tu et al. in 2018,^[13] helped to clarify the taxonomic situation, and the Amphibian Species of the World database reverted to treating Rhombophryne, Anilany, and Stumpffia as valid genera.^[15]

There are over 40 currently recognised species:^{[1][2][16][17]}

The taxon Stumpffia helenae'' Vallan, 2000 was transferred to Anilany^[7] and therefore does not appear on this list.