摘要A new species of small tree frog from a primary montane tropical forest of central Vietnam,Tay Nguyen Plateau,is described based on morphological,molecular,and acoustic evidence.The Golden Bug-Eyed Frog,Theloderma auratum sp.nov.,is distinguishable from its congeners and other small rhacophorid species based on a combination of the following morphological attributes:(1) bony ridges on head absent;(2) smooth skin completely lacking calcified warts or asperities;(3) pointed elongated tapering snout;(4) vocal opening in males absent;(5) vomerine teeth absent;(6) males of small body size (SVL 21.8-26.4 mm);(7) head longer than wide;ED/SVL ratio 13％-15％;ESL/SVL ratio 16％-20％;(8)small tympanum (TD/EL ratio 50％-60％) with few tiny tubercles;(9) supratympanic fold absent;(10) ventral surfaces completely smooth;(1 1) webbing between fingers absent;(12) outer and inner metacarpaltubercles present,supernumerary metacarpal tub ercle single,medial,oval in shape;(13) toes half-webbed:Ⅰ 2-21/4 Ⅱ 11/2-23/4 Ⅲ 2-31/4 Ⅳ 3-11/2 Ⅴ;(14) inner metatarsal tubercle present,oval;outer metatarsal tubercle absent;(15) iris bicolored;(16) dorsal surfaces golden-yellow with sparse golden-orange speckling or reticulations and few small dark-brown spots;(17) lateral sides of head and body with wide dark reddish-brown to black lateral stripes,clearly separated from lighter dorsal coloration by straight contrasting edge;(18) ventral surfaces of body,throat,and chest greyish-blue with indistinct brown confluent blotches;(19) upper eyelids with few (3-5) very small flat reddish superciliary tubercles;(20) limbs dorsally reddish-brown,ventrally brown with small bluish-white speckles.The new species is also distinct from all congeners in 12S rRNA to 16S rRNA mitochondrial DNA fragment sequences (uncorrected genetic distance P＞8.9％).Advertisement call and tadpole morphology of the new species are described.Our molecular data showed Theloderma auratum sp.nov.to be a sister species of Th.palliatum from Langbian Plateau in southern Vietnam.