Proceratophrys strussmannae

Diagnosis. The monophyly of the genus Proceratophrys based on synapomorphies are still pending (Prado & Pombal, 2008). Thus, the new species is allocated in the genus Proceratophrys by its overall morphological similarity. The new species is tentatively assigned to the Proceratophrys cristiceps species group (sensu Giaretta et al., 2000) by the absence of prominent palpebral appendages and postocular swellings, and is characterized by: medium-sized (SVL of adult males 41.1 – 47.3 mm (n = 10), SVL of adult females 52.6 – 59.8 mm (n = 7 )), snout rounded in dorsal view, obtuse in lateral view, dorsal skin uniformly rugose, without elevated warts, and tympanum defined as a depression in the skin. Comparison with the other species. From the other species of P. cristiceps species group (Figure 2, Table 1), P. strussmannae sp. nov. can be distinguished by the following characters (those of the compared species in parenthesis): from P. concavitympanum by the slightly narrow head in males (22.8 – 22.9 mm, that represents 47.8 % of SVL in average vs. 46.6 % SVL in average in P. strussmannae sp. nov.), smaller thighs (15.1 – 20.7 mm in males and 20.1 – 24.4 mm in females, that represents 39 % and 38 % of SVL vs. 33 % and 27.5 % of SVL in males and females of P. strussmannae sp. nov., respectively; Santana et al., 2010), absence of flaring lips (with flaring lip), less elevated warts on dorsum (high elevated warts; Figure 3), dorsal crests less defined, inner metatarsal tubercle dark brown keratinized, at least in the edge (not colored; Figure 3). Multivariate analysis of morphometric data indicate that P. concavitympanum does not overlap with the new species along PCI (explain 24.3 % of variation), which has high loadings of HL and END, and PCII (explain 21.2 % of variation), which has high loadings of F and H (Figure 4, Table 2). From P. cristiceps, the new species can be distinguished by its the dorsal crests less defined beyond the sacral region, tympanum as a depression in the skin (hidden), snout obtuse (vertical), and head length at about 25 % of SVL (head length about 30 % of SVL). From P. cururu by larger SVL (36.5 – 43.1 mm in males, 47 – 53.9 mm in females), narrow head (head width 41 % larger than length), tympanum as a depression in the skin (hidden), finger IV longer than II (finger II longer than IV), (Eterovick & Sazima 1998). From P. goyana by the tympanum defined as a depression in the skin (hidden), snout obtuse in lateral view (vertical), rows of parallel warts in the outer margin of the forearm 5 – 8 (2 – 5 warts), dorsal crests less defined beyond the sacral region (more defined until the coccyx), canthal crests better defined (not evident).