Vietnamophryne aurantifusca sp. nov. (Figure 2) Holotype. IEBR A.5242 (Field number NH.2023.214), adult male, collected in the karst forest of Sinh Long Commune, Na Hang District, Tuyen Quang Province, Vietnam (22°31’03.4”N; 105°23’18.6”E, at an elevation of 1.056 m a.s.l.) on 25 May 2023 by Nguyen et al. Paratype. Adult male IEBR A.5243 (Field number NH.2023.215), the same data as the holotype. Diagnosis. The new species from Tuyen Quang is distinguished from its congeners on the basis of the following characteristics: (1) Body size small SVL (n= 2 males, 17.6–18.2 mm); (2) Head wider than long, HW/HL 1.17–1.19; (3) snout short, round in dorsal view (SL/ HW 0.33–0.35), snout length greater than eye length (SL/ EL 1.33 – 1.50); (4) eye round (EL / HW 0.23–0.25; (5) tympanum small, round, TYD / SVL 0.04–0.05; (6) first finger (F1) well developed, more than half of second finger (F2) (1 FLO/2 FLO 0.58–0.64), relative finger lengths: I

Published as part of Ninh, Hoa Thi, Le, Linh Tu Hoang, Bui, Hai Tuan, Nguyen, Huy Quoc, Orlov, Nikolai, Moseyko, Olga Bezman, Le, Manh Van, Nguyen, Sang Ngoc, Hoang, Chung Van, Ziegler, Thomas & Nguyen, Tao Thien, 2023, A new species of Vietnamophryne (Anura: Microhylidae) from Northeastern Vietnam, pp. 505-518 in Zootaxa 5374 (4) on pages 509-515, DOI: 10.11646/zootaxa.5374.4.3, http://zenodo.org/record/10158674