Pristimantis diadematus

A morphologically diagnosable subgroup within the Pristimantis unistrigatus (Günther, 1859) species group shares very large digital tips, relatively short hind limbs, tuberculate dorsum, a " W ″ scapular pattern, and prominent leg barring (Hedges & Schlüter, 1992). However, this subgroup (Pristimantis diadematus series) was evidenced to be non-monophyletic (Hedges et al., 2008). We recorded at the RBJ one species attributed to this morphological subgroup, with its characteristic mostly fitting in the diagnosis of Pristimantis eurydactylus Hedges & Schlüter, 1992, notably by possessing a visible tympanum and a smooth dorsum. However, P. eurydactylus is little known and much of its associated information comes only from its original description (Hedges & Schlüter, 1992). In addition, its diagnostic characteristics are quite subject to variation and is difficult to elucidate the taxonomic and geographic boundaries between P. eurydactylus and Pristimantis diadematus Jiménez de la Espada, 1875, which is more widely distributed in the Amazonian Andean foothills and adjacent lowlands (Jiménez de la Espada, 1875; Frost, 2022). Without a finer taxonomic resolution and new field data, it is impossible to assign a more precise taxonomic status to this RBJ′s population. In addition to the aforementioned characters, P. cf. diadematus has a belly marked by contrasting small dark dots and greenish flanks in life.