Map showing the type locality of Synapturanus danta sp. nov. (black star), and the localities of the closest populations of Synapturanus. Those correspond to four undescribed taxa (Fouquet et al. 2021a): S. sp “Iça 1” (pale blue circle). S. sp. “Iça 2” (yellow circle) from Brazil, S. sp “Divisor” from Brazil and Perú (red circles), and S. sp. “Nanay” from Perú (pink circle). Green patches represent Amazon peatlands present in the area (Xu et al. 2018).

Phylogenetic analysis based on a fragment of 16S, showing the relationship among Synapturanus danta sp. nov. (in red), its congeners, and species of Adelestes and Otophryne (Microhylidae). ML bootstrap values are indicated at each node. Taxa assignation to central, eastern and western clade follows Fouquet et al. (2021a).

Plots of PCA of A. Morphometric characteristics (males and females) and B. Acoustic variables showing the position of Synapturanus danta sp nov. (black asterisk) from unnamed lineages of Fouquet et al. (2021a): Synapturanus sp. “Juami” (gray squares); S. sp. “Iça1” (black squares only females); S. cf. mirandariberoi (black triangles); S. sp. “Purus” (blue triangles); S. sp. “Taboca” (gray triangle); S. sp. “Tapajos” (white triangle); S. zombie (inv. black triangle); S. mesomorphus (inv. gray triangle); S. ajuricaba (inv. blue triangle); S. sp. “Neblina” (inv. white triangle); S. sp. “Divisor” (gray asterisk); S. sp. “Ecuador” (black dot); S. sp. “Venezuela” (gray dot); S. sp. “Iça2” (blue dot); S. rabus (orange dot), S. sp. “Nanay” (green dots) .

Lateral (A.), dorsal (B.) and ventral (C.) views of the head; Dorsal (D.) and ventral (E.) views of the body of the holotype (CORBIDI 21050, SVL=17.9 mm) of Synapturanus danta sp. nov. Photographs by Eduardo Quispe-Salcedo.

Type series of Synapturanus danta sp. nov. in life. A, B. Dorsal and ventral view of male CORBIDI 21050 (holotype, SVL=17.9 mm); C, D. Dorsal and ventral view of male CORBIDI 21051 (SVL=17.6 mm); E, F. Dorsal and ventral view of male CORBIDI 21013 (SVL=7.5 mm). Photographs by Germán Chávez.

Audio spectrograms and oscillograms of the advertisement call of the holotype (CORBIDI 21050) of Synapturanus danta sp. nov.. recorded at night, in the Lower Putumayo River basin. A. Single call; B. Series of two calls

Panoramic view of the type locality (A.) and a view of the landscape in the Amazonian Peatlands inhabited by Synapturanus danta sp. nov. (B.). Photographs by Alvaro del Campo (A.) and Luis Montenegro (B.).