Sylvirana cf. cubitalis (Smith, 1917)

Nguyen, Tan Van, Brakels, Peter, Maury, Nathanael, Sudavanh, Somchit, Pawangkhanant, Parinya, Idiiatullina, Sabira, Lorphengsy, Sengvilay, Inkhavilay, Khamla, Suwannapoom, Chatmongkon & Poyarkov, Nikolay A., 2020, New herpetofaunal observations from Laos based on photo records, Amphibian & Reptile Conservation (e 248) 14 (2), pp. 218-249 : 226

Sylvirana cf. cubitalis (Smith, 1917)

Siam Stream Frog ( Fig. 4F )

Several individuals of S. cubitalis were observed by P. Phiapalath on 28 December 2019 in Nam Phouy NPA, Thongmyxay District , Xaignabouli Province (18°35.928’N, 101°17.054’E; elevation 630 m asl) .

Morphological characters of the individuals from Xaignabouli Province agreed well with the descriptions of Taylor (1962), Stuart et al. (2006), Ohler (2007), Fei et al. (2010), Pham et al. (2014), and Manthey and Manthey (2017a). The photographed individual ( Fig. 4F ) agrees with the diagnosis of S. cubitalis in the following characters: body medium-sized; snout obtusely pointed; canthus rostralis distinct, loreal region slightly concave; pupil round; tympanum round, distinct; supratympanic fold present; fingers free of webbing without discs; toes with small discs, webbing well developed; dorsal skin rough; tympanum and flanks region with small tubercles; tubercles forming longitudinal ridges on dorsal surface of limbs; dorsolateral fold distinct; coloration of dorsum reddish-brown, canthal streak black; tympanum dark brown; flanks brownish-gray with black spots; upper hindlimbs with wide dark pale bars; ventral surface cream.

Ecological notes. The individuals were found at ca. 1900–2000 h perched on rocks and fallen logs along the stream. The surrounding habitat consisted of riparian vegetation and evergreen forest with an abundance of palm trees ( Arecaceae ).

Distribution. In Laos, this species has been recorded from Phongsali and Louangnamtha provinces ( Stuart et al. 2006; Manthey and Manthey 2017a). This is the first record from Xaignabouli Province. Elsewhere, this species has been reported from China, Myanmar, Vietnam, and Thailand ( Frost 2020).

Figures

Fig. 4. (A) Ophryophryne pachyproctus in Longcheng District, Xaisomboun Province; (B) Xenophrys palpebralespinosa in Mork District, Xiangkhouang Province; (C) Glyphoglossus guttulatus in Pathoumphone District, Champasak Province; (D) G. molossus in Savannakhet Province; (E) Rana johnsi in Xaignabouli Province; (F) Sylvirana cubitalis in Thongmyxay District, Xaignabouli Province. Photos by P. Pawangkhanant (A), P. Brakels (B–C), K. Inkhavilay (D), N. Maury (E), and P. Phiapalath (F).