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Diploderma yangi WANG, ZHANG & LI, 2022

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Higher TaxaAgamidae (Draconinae), Sauria, Iguania, Squamata (lizards)
Subspecies 
Common NamesE: Zayu Mountain Dragon
Chinese: 察隅龙蜥 (Chá Yú Lóng Xî) 
SynonymDiploderma yangi WANG, ZHANG & LI 2022
Japalura flaviceps — HU et al. 1987
Japalura flaviceps — ZHAO & YANG 1997
Japalura flaviceps — ZHAO et al. 1999
Japalura laeviventris — RAO et al. 2017
Japalura laeviventris — RAO 2020
Japalura laeviventris — SUN & GAO 2017
 
DistributionChina (Tibet Autonomous Region: Along the upper Salween Valley in Zayu County, Nynchi Prefecture)

Type locality: Cawarong (=Chawalong) Village, Zayu County, Nynchi Prefecture, Tibet Autonomous Region, China (28.479ºN, 98.4656ºE, elevation 1887m)  
ReproductionOviparous. None of the collected females were gravid, suggesting that the survey time in September already passed the breeding season of the species. (Wang et al. 2022) 
TypesHolotype: SWFU 005414, adult male, from Cawarong Village, Zayu County, Tibet Autonomous Region, China (28.479ºN, 98.4656ºE, elevation 1887 m). Collected by Liu Xiaolong, Li Xianqi, and Tie Minhua on 6 September 2020.
Paratypes: SWFU 005415, 006812, adult males; SWFU 005417, 005418, subadult males; SWFU 005410–13, 005419, adult females. All share the same locality and collector information as the holotype. 
DiagnosisDiagnosis: Diploderma yangi sp. nov. can be diagnosed from congeners by a combination of the following morphological characters: (1) adult body size moderate, SVL 57.8–64.5mm in adults; (2) tail long, TAL 202.8–216.6% SVL in males, 196.8–208.8% in females; (3) head width moderately wide, HW 69.0%–73.9% HL; (4) hind limbs long, HLL 69.6–86.3% SVL; (5) tympanum concealed; (6) crest scales small and numerous, MD 45–59; (6) feeble skin fold under nuchal crest in males, no skin fold under dorsal crest; (7) conical scales present on post temporal, post tympanic, and post rictal regions, each bearing 3–6 keels, POS 2–6, PTY 2–7, PRS 2–6; (8) F4S 14–18, T4S 20–24; (9) NSL mostly 1, rarely 0; (10) transverse gular fold present, distinct; (11) ventral head and body scales strongly keeled; (12) distinct radial dark stripes present around eyes; (13) dorsal background coloration Pale Pinkish Buff (Color 3), speckled with Warm Sepia (Color 40) to Dusky Brown (Color 285) spots laterally inferior to dorsolateral stripes; (14) dorsolateral stripes smooth edged and Pale Emerald Green (Color 141) to Light Pistachio (Color 101) in males, slightly wavy and Pale Buff (Color 1) to Pinkish Buff (Color 3) in females; (13) gular spot present in both sexes, Pale Emerald Green (Color 141) to Light Pistachio (Color 101), paler in females; and (14) oral cavity and tongue pale Light Flesh Color (Color 250). (Wang et al. 2022).


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CommentSimilar species: Diploderma laeviventre

Distribution: Rao et al. (2017) first recorded D. laeviventre in the Nujiang Prefecture of Yunnan Province, extending the distribution of the species southwards over hundreds of kilometers, and such distribution data were accepted by later studies (Sun & Gao, 2017; Rao 2020). However, Rao’s distribution extension was based on misunderstanding of literature, as pointed out by Wang et al. (2019 b). Our discovery of D. yangi in the Salween valley next to the provincial border in Tibet further exclude the possibility of having D. laeviventre in Yunnan, as any population of D. laeviventre in Yunnan will be allopatric. It is possible that our new species D. yangi extents its distribution southward into Yunnan along the Salween River, but its distribution would be limited to the north of Qiunatong Village in Gongshan County. 
EtymologyThe new species name is derived from the last name of Chinese herpetologist, Dr. Datong Yang, from Kunming Institute of Zoology, Chinese Academy of Sciences. We name the new species after Dr. Yang in honoring his pioneer works and lifetime contributions to the herpetological research in the Hengduan Mountain Region in China. 
References
  • Hu S. et al. 1987. Amphibia-Reptilia of Xizang. [In Chinese] Beijing: Science Press, 153 pp.
  • Rao, D. 2020. Atlas of Wildlife in Southwest China: Reptile. [in Chinese] Beijing Publishing House, Beijing, 491 pp.
  • RAO, Dingqi; Jens V. VINDUM, Xiaohui MA, Mingxia FU and Jeffery A. WILKINSON 2017. A New Species of Japalura (Squamata, Agamidae) from the Nu River Valley in Southern Hengduan Mountains, Yunnan, China. Asian Herpetological Research 8 (2): 86-95, DOI:10.16373/j.cnki.ahr.160053 - get paper here
  • Sun, H. & Gao, Z. 2017. Species Red List of Yunnan Province: 2017 Version. [in Chinese] Yunnan Science and Technology Press, Kunming, 705 pp.
  • Wang, K., Ren, J. L., Jiang, K., Wu, J. W., Yang, C. H., Xu, H. M., ... & Che, J. 2019. Revised distributions of some species in the genus Diploderma (Reptilia: Agamidae) in China. Sichuan J. Zool, 38(5), 481-495
  • WANG, K., ZHANG, Y., & LI, X. 2022. A New Species of Diploderma (Reptilia: Squamata: Agamidae) from the upper Salween River in Eastern Tibet, China. Zootaxa 5099 (2): 201-220 - get paper here
  • Zhao E. M., Zhao K., Zhou K. Y. 1999. Fauna Sinica, Reptilia, Vol. 2, Squamata, Lacertilia. [In Chinese] Beijing: Science Press, 394 pp
  • Zhao, E & Yang, D. 1997. Amphibians and Reptiles of the Hengduan Mountain Region. [in Chinese] Science Press, Beijing, 303 pp.
 
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