Pachytriton airobranchiatus sp. nov. Li, Yuan and Wu (FigS. 3–8) Holotype. SWFUYZY0301 (FigS. 4–6), an adult male from Mt. Lianhua, Huidong County, Huizhou in Guangdong (23.0674°, 115.2364°, eleVation 980 m) collected by CL on May 17, 2017. Paratypes. SWFUYZY0213 (adult male), SWFUYZY0214 (adult male), SWFUYZY0215 (adult male), SWFUYZY0216 (adult male), SWFUYZY0217 (adult female), SWFUYZY0218 (adult female), SWFUYZY0219 (juVenile), collected at the Same locality aS the holotype. Diagnosis. The new SpecieS iS aSSigned to the genuS Pachytriton on the baSiS of following characterS: head oVal and flat; Skin Smoothly; bony ridgeS abSent; labial foldS diStinct on upper jaw; limbS Short; dorSal Vertebral ridge indiStinct; baSe tail broad and poSterior half gradually laterally compreSSed; dorSal caudal fin obViouS (Wu et al. 2012a; Yuan et al. 2016). Pachytriton airobranchiatus sp. nov. iS diStinguiShed from itS congenerS by a combination of morphological characterS: (1) prominently eleVated diStal end of the epibranchial bone, Showing aS two conSpicuouS protruding bulgeS behind the head; (2) dorSal coloration can be either black-Spotted or unSpotted; (3) bright orange dotS abSent on dorSum; (4) coStal grooVeS abSent between axilla and groin; (5) finger I and toe I Slender, do not form aS Volar pad; (6) dorSal tipS of fingerS and toeS brown; (7) tipS of fore- and hind limbS could contact when limbS adpreSSed againSt body flank. Comparisons. The moSt conSpicuouS morphological difference between P. airobranchiatus and itS congenerS iS itS prominently eleVated diStal end of the epibranchial bone. In addition, the new SpecieS differS from P. changi and P. xanthospilos by not haVing orange ribbon-like dotS on the dorSolateral Side (VS. both SpecieS haVing orange SpotS or blotcheS which extend ribbon-like along the dorSolateral SideS). Lacking coStal grooVeS between axilla and groin, Pachytriton airobranchiatus sp. nov. differS from P. inexpectatus, P. granulosus and P. feii. It further differS from P. wuguanfui by haVing brown dorSal tipS of fingerS and toeS in life (finger and toe tipS appear orange on the dorSal Side in P. wuguanfui); and Slender fingerS I and toe I, which do not formS aS Volar pad (fingerS I and toe I extremely Short and formS aS Volar pad in P. wuguanfui). It differS from P. moi by haVing orange blotcheS on Venter (VS. lack of orange blotcheS on Venter in P. moi). Description of the holotype. Specimen in good StatuS of preSerVation. MeaSurementS giVen in Table 3. TTL 149.3 mm, TAL Shorter than SVL(TAL/SVL = 0.97); head oVal and flat, Slightly longer than wide (HW/HL = 0.81), rectangle in dorSal View; Snout truncate in both Ventral View and lateral View, protruding Slightly beyond lower jaw (Fig. 4); noStril Small, located nearly to tip of Snout; eyeS Small (EL = 2.9 mm), eye diameter Smaller than Snout length (EL/SL = 0.40); the corner of the mouth tangent to the middle of eye in lateral View. labial fold diStinct on upper jaw; gular foldS obViouS; prominently eleVated diStal end of the epibranchial bone, Showing aS two conSpicuouS protruding bulgeS behind the head; Vomerine tooth SerieS Ʌ-like, located on front of maxillary; tongue Short and pad elliptical, adhereS to mouth floor with free lateral marginS; loreal region SlopeS Steeply downward anteriorly in lateral View; Skin Smooth; dorSal Vertebral grooVe inconSpicuouS; coStal grooVeS between axilla and groin abSent. Forelimb Short (AL/SVL = 0.15), tipS of forelimbS only reach the middle of eyeS when extended roStrally; fingerS Short and Slender, without webbing; lateral fringeS deVeloped Slightly (Fig. 5); relatiVe length of fingerS I

Published as part of Li, Chen, Yuan, Zhiyong, Li, Haibin & Wu, Yunke, 2018, The tenth member of stout newt (Amphibia: Salamandridae: Pachytriton): Description of a new species from Guangdong, southern China, pp. 207-219 in Zootaxa 4399 (2) on pages 212-216, DOI: 10.11646/zootaxa.4399.2.5, http://zenodo.org/record/1206596