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Tropidophorus guangxiensis WEN, 1992

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Higher TaxaScincidae, Sphenomorphinae (Sphenomorphini), Scincoidea, Sauria, Squamata (lizards)
SubspeciesTropidophorus guangxiensis guangxiensis WEN 1992
Tropidophorus guangxiensis hongjiangensis GUO et al. 2021 
Common NamesChinese: 广西棱蜥 
SynonymTropidophorus guangxiensis WEN 1992
Tropidophorus guangxiensis — GREER & BISWAS 2004
Tropidophorus guangxiensis — GUO, SHU, WU, CHEN, HOU, CHI & DENG 2021 
DistributionChina (Guangxi, Hunan)

Type locality: Darning Shan, Wuming Xian (county), Guangxi Zhuang Autonomous Region, China; 1,240 m elevation, (23° 23' N 108° 30' E). Neotype locality: Daming Mountain National Nature Reserve (N23°30 ′1 ′′ and E108°26′19′′), Wuming County, Guangxi Zhuang Autonomous Region, China, at an altitude of 1244 m a.s.l.

hongjiangensis: China (Hunan: Xuefeng Mountain National Forest Park); Type locality: Xuefeng Mountain National Forest Park (N27°18 ′57 ′′ and E110°23 ′55 ′′), Hongjiang County, Hunan Province, China, at an altitude of 1125 m a.s.l.  
Reproductionovovivparous 
TypesNeotype: HNU GKJ-2019007 (adult female), collected on 21 August 2019 by Ke-Ji Guo et al.; designation by Guo et al. 2021. Original holotype: GMU (given as GMC, Guangxi Medical College) 85-032, a juvenile.
Holotype: HNU GKJ-2016009, adult female, collected on 5 June 2016 by Ke-Ji Guo; Paratype: HNU GKJ-2016022 (sub-adult female) and HNU GKJ-2016023 (juvenile), collected on 15 June 2016 by Wei- Ping Xia [hongjiangensis] 
DiagnosisDiagnosis: This new species closely resembles Tropidophorus sinicus Boettger, but differs from the latter by the following characters: a single postmental, head nearly triangle, interparietal separating parietals (Boulenger, 1887; Smith, 1935; Tian and Jiang, 1986).

Diagnosis: Upper head scales strongly striated; supranasal absent; frontonasals 2, joined, longer than wide; prefrontals 2, joined or separated by small scale; interparietal single and small, without small transparent spot; parietals separated by interparietal, posterolateral border surrounded by 5–6 scales on each side; nuchal scales absent; supraciliaries 8, supraciliary row complete along length of lateral edge of supraoculars; loreals 2; presuboculars 1, upper anterior and lower posterior margin slightly convex, and terminal pointed; supralabials 8; infralabials 6–7; shallow groove on loreal-labial border, from posterior corner of nasal across subocular obliquely downward to end of sixth supralabial; midbody scales in 28–29 rows; paravertebral scales 45–50, not widened; ventral scales 50–53; midbody ventral scales 27–29; ventral scales of neck keeled; scale rows at tenth subcaudal 11–13; lamellae under fourth toe 17–18; scales of limbs keeled above and below; supralabials and infralabials black, each scale with white spot center; chin and throat grayish white with black marble; ventral of neck gray, each scale white in middle forming longitudinal white stripes; venter yellowish white; underside of tail white, subcaudals darkened on both sides, forming longitudinal white stripes (Guo et al. 2021).

Comparisons: Based on the designated neotype and paraneotype, we compared Tropidophorus guangxiensis guangxiensis with congeners from China (morphological data of congeners were taken from literature: Fei et al., 2010; Guo et al., 2010; Rao et al., 2011; Wen, 1992; Yang & Inger, 1986; Yang & Rao, 2008; Zhang et al., 2012; Zhao & Adler, 1993; Zhao et al., 1999) (Supplementary Table S5): Tropidophorus guangxiensis guangxiensis can be distinguished from T. berdmorei, T. hainanus, and T. sinicus by supralabials 7–8 (vs. 6 in all latter species); the subspecies can be distinguished from T. berdmorei by paravertebral scales 49–50 (vs. 64), upper head and dorsal body scales striated or keeled (vs. smooth), midbody scale rows 28–29 (vs. 32–40), and lamellae under fourth toe 17–18 (vs. 22). Tropidophorus guangxiensis guangxiensis can be distinguished from T. hainanus by parietals separated posteriorly (vs. in contact posteriorly), loreals 2 (vs. 4), supraciliaries 8 (vs. 5), supraciliary row complete along length of lateral edge of supraoculars (vs. supraciliary row interrupted by fourth supraocular), midbody scale rows 28–29 (vs. 30–34), and lamellae under fourth toe 17–18 (vs. 13–16). Tropidophorus guangxiensis guangxiensis can be distinguished from T. sinicus by ventral scales smooth (vs. keeled), supraciliaries 8 (vs. 6), infralabials 6–7 (vs. 5), and lamellae under fourth toe 17–18 (vs. 13–14) (Guo et al. 2021).

Diagnosis (hongjiangensis): Loreals 2; infralabials 6; supralabials 8; paravertebral scales 45–47; parietals separated; supraciliaries 6–8; supraciliary row complete; upper anterior and lower posterior margin of presuboculars slightly concave, terminal blunt and rounded; scales on upper head and dorsal body striated or keeled; ventral scales smooth; midbody scale rows 30–33; lamellae under fourth toe 16–19; throat and ventral of neck black; ventral limbs brown, darker than ventral body; middle and posterior ventral tail black (Guo et al. 2021).

Comparisons (hongjiangensis: Morphological comparisons were based on five T. g. guangxiensis and six Tropidophorus guangxiensis hongjiangensis ssp. nov. specimens (Supplementary Tables S3–S5). The new subspecies can be distinguished from the nominal subspecies by midbody scale rows 30–33 (vs. 28–29), midbody ventral scales 30–33 (vs. 27–29), upper anterior and lower posterior margin of presuboculars slightly concave and terminal blunt and rounded (vs. upper anterior and lower posterior margin slightly convex and terminal pointed) (Supplementary Figure S3E, F, e, f). The new subspecies can be further distinguished from T. g. guangxiensis by throat and ventral neck black (Figure 1D, F; Supplementary Figure S3B, D, a, b, c, d) (vs. gray (Supplementary Figures S1, S2, S3A, C, a, b, c, d)), ventral limbs brown and darker than ventral surface (Figure 1F; Supplementary Figure S3G, g, h) (vs. ventral limbs orange and consistent with ventral surface (n=2; Supplementary Figures S2, S3H, i, j)), middle and posterior ventral of tail black (n=6) (vs. middle and posterior ventral of tail white, (n=2); Figure 1E; Supplementary Figures S2, S3K) (Guo et al. 2021). 
Comment 
EtymologyNamed after the type locality. 
References
  • Chuaynkern, Y., Nabhitabhata, J., Inthara, C. Kamsook, M. & K. Somsri 2005. A New Species of the Water Skink Tropidophorus (Reptilia: Squamata: Scincidae) from Northeast Thailand. The Thailand Natural History Museum Journal 1(2): 165-176 - get paper here
  • GAO, ZHIWEI; TIANYU QIAN, JIANPING JIANG, DEJIA HOU, XUEJIAN DENG & DAODE YANG. 2022. Species diversity and distribution of amphibians and reptiles in Hunan Province, China. Biodiversity Science 30 (2): 21290, 1–15 - get paper here
  • Greer, A.E. & Biswas, S. 2004. A Generic Diagnosis for the Southeast Asian Scincid Lizard Genus Tropidophorus Dumeéril and Bibron, 1839 with Some Additional Comments on Its Morphology and Distribution. Journal of Herpetology 38 (3): 426-430 - get paper here
  • GUO Ke-Ji; MI Xiao-Qi; DENG Xue-Jian 2010. Tropidophorus—A New Record of Genus in Reptile in Hunan. Chinese J. Zool. - get paper here
  • Guo, Ke-Ji; Fu Shu, Nan-Fei Wu, Shun-De Chen, Mian Hou, Sheng-Chao Shi, Xue-Jian Deng 2021. Neotype designation and redescription of Tropidophorus guangxiensis Wen, 1992 (Squamata: Sauria: Scincidae), with description of a new subspecies from central South China. Zool. Res. 2021, 42(5): 606−613 - get paper here
  • Nguyen, Quang Truong; Nguyen Van Sang, Nikolai Orlov, Hoang Ngoc Thao, Wolfgang Böhme and Thomas Ziegler 2010. A review of the genus Tropidophorus (Squamata, Scincidae) from Vietnam with new species records and additional data on natural history. Zoosyst. Evol . 86 (1): 5 – 19
  • Wang, Kai; Jinlong Ren, Hongman Chen, Zhitong Lyu, Xianguang Guo Ke Jiang, Jinmin Chen, Jiatang Li, Peng Guo, Yingyong Wang, Jing Che 2020. The updated checklists of amphibians and reptiles of China. Biodiversity Science 28 (2): 189-218 - get paper here
  • Wen Y 1992. A new species of the genus Tropidophorus (Reptilia: Lacertilia) from Guangxi Zhuang Autonomous Region, China. Asiatic Herpetological Research 4: 18-22 - get paper here
 
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