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Cyrtodactylus sangi PAUWELS, NAZAROV, BOBROV & POYARKOV, 2018

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Higher TaxaGekkonidae, Gekkota, Sauria, Squamata (lizards: geckos) 
Subspecies 
Common NamesE: Nui Chua Bent-toed Gecko
Dutch: Nuichuakromvingergekko
French: Cyrtodactyle de Nui Chua
Russian: Нюйтюинский кривопалый геккон [Nuityuynskiy krivopalyi gekkon]
Vietnamese: Thằn lằn chân ngón Núi Chúa 
SynonymCyrtodactylus sangi PAUWELS, NAZAROV, BOBROV & POYARKOV 2018
Cyrtodactylus irregularis — BOBROV & SEMENOV 2008 (partim)
Cyrtodactylus sp2 — NAZAROV et al. 2012
Cyrtodactylus sp2 — NGUYEN et al. 2013
Cyrtodactylus sp2 — NGUYEN et al. 2014
Cyrtodactylus sp. — NGUYEN et al. 2017 
DistributionS Vietnam (Ninh Thuan Province)

Type locality: Nui Chua National Park (11°42'06,5" N, 109°08'50,4" E; alt. ca. 230 m asl), Ninh Thuan Province, southern Vietnam  
Reproduction 
TypesHolotype: ZMMU R-14995 adult male. Collected by V.V. Bobrov on 11–12 Oct. 2003. Paratype. ZMMU R-11503; adult female, bearing the same locality and collecting date as the holotype. 
DiagnosisDiagnosis. Cyrtodactylus sangi sp. nov. can be distinguished from all other congeners by its small size (maximal known SVL of 56.3 mm); dorsal tubercles in 19–21 irregular rows at midbody; 37 midbody scale rows across belly between ventrolateral skin folds; presence of a continuous angular series of seven pore-bearing (male) or four pitted (female) enlarged precloacal scales, separated by a diastema of undifferentiated scales from four poreless and pitless enlarged femoral scales on each side; absence of precloacal groove; absence of transversely enlarged median subcaudal scales; and a highly irregular banded dorsal pattern.

Comparison with other species. Based on molecular data, Cyrtodactylus sangi sp. nov. is the sister species to a clade containing C. cattienensis sensu stricto + Binh Chau—Phuoc Buu N.R. population (Fig. 7). Among the species of the Cyrtodactylus irregularis group, Cyrtodactylus sangi sp. nov. differs from Binh Chau—Phuoc Buu N.R. population by its smaller SVL (56.3 vs. 63.7 mm), its higher Ven (37 vs. 30–33), a lower number of interorbital scales (19 vs. 20–24), its irregular (vs. regular) nuchal collar, and its highly irregular dark tail bands (vs. regular) with band length much shorter than intervals (vs. subequal). It differs from C. bidoupimontis by its much smaller SVL (maximal known SVL 56.3 vs. 86.3 mm), lower Ven (37 vs. 38-43), higher number of precloacal pores in males (7 vs. 4–6), lower number of enlarged femoral scales on each side (4 vs. 8–10), highly irregular (vs. regular), medially interrupted (vs. uninterrupted), nuchal collar, without (vs. with) white bordering, higher number of dark tail bands (11 vs. 7–9), and highly irregular (vs. regular) dark tail bands with band length much shorter (vs. longer) than intervals. It differs from C. bugiamapensis by its much smaller size (maximal known SVL 56.3 vs. 76.8 mm), lower number of enlarged femoral scales on each side (4 vs. 6–8), generally lower DorTub (19–21 vs. 20–24) and generally lower Ven (37 vs. 36–46), highly irregular, medially interrupted, nuchal collar, without white bordering (vs. regular and with white bordering), dorsum with highly irregular thin bands (vs. irregular spots), and highly irregular (vs. regular) dark tail bands with band length much shorter (vs. longer) than intervals. It is distinguished from C. cattienensis sensu stricto by its smaller size (maximal known SVL 56.3 vs. 64.8 mm), highly irregular dark tail bands (vs. regular) with band length much shorter than intervals (vs. subequal), its medially interrupted, irregular (vs. regular) nuchal collar, and its much more irregular dorsal bands. From C. cryptus, it differs by its much smaller size (maximal known SVL 56.3 vs. 90.8 mm), its smaller Ven (37 vs. 47–50), its smaller number of precloacal pores (7 vs. 9–11), its lower numbers of subdigital lamellae on the 4th toe (18 vs. 20–23) and the 4th finger (16 vs. 18–19), its medially interrupted (vs. uninterrupted), irregular (vs. regular) nuchal collar without (vs. with) yellowish bordering, and dark tail bands much shorter (vs. longer) than band-interspace. It can be separated from C. cucdongensis by its smaller size (maximal known SVL 56.3 vs. 65.9 mm), generally higher DorTub (19–21 vs. 16–19), its lower Ven (37 vs. 41–44), its higher number of precloacal pores in males (7 vs. 5–6), and its lower number of enlarged femoral scales on each side (4 vs. 5–9). It differs from C. dati by its smaller size (maximal known SVL 56.3 vs. 70.1 mm), smaller number of paravertebral tubercles (27–29 vs. 34–35), smaller Ven (37 vs. 42–48), and higher number of precloacal pores in males (7 vs. 5 or 6). It differs from C. gialaiensis by its smaller size (maximal known SVL 56.3 vs. 62.8 mm), smaller Ven (37 vs. 38–45), lower number of precloacal pores in males (7 vs. 9 or 10), and its medially interrupted (vs. uninterrupted) nuchal collar. It is distinguishable from C. huynhi by its smaller size (maximal known SVL 56.3 vs. 79.8 mm), its higher DorTub (19–21 vs. 16–18), its lower Ven (37 vs. 43–46), a medially interrupted (vs. uninterrupted), irregular (vs. regular) nuchal collar, and dark tail bands much shorter (vs. longer) than inter-band spaces. From C. irregularis, it differs by its smooth (vs. pitted) enlarged femoral scales, by lacking (vs. having) light margins around the dark marks on the back, and by lacking (vs. having) enlarged spurs on the whorls of the tail base. It can be separated from C. phuocbinhensis based on its smaller size (maximal known SVL 56.3 vs. 60.4 mm), lower number of enlarged femoral scales on each side (4 vs. 5), lower Ven (37 vs. 43–47), higher number of dark tail bands (11 vs. 10) and its transversal (vs. longitudinal) dorsal colour pattern. It differs from C. pseudoquadrivirgatus by its much smaller size (maximal known SVL 56.3 vs. 83.3 mm), its lower Ven (37 vs. 41–58), and the presence (vs. absence) of enlarged femoral scales. From C. taynguyenensis it differs by its much smaller size (maximal known SVL 56.3 vs. 85 mm), the presence (vs. absence) of enlarged femoral scales, its higher number of precloacal pores in males (7 vs. 6), its lower Ven (37 vs. 42–49), its medially interrupted (vs. uninterrupted), irregular (vs. regular) nuchal collar, and dark tail bands much shorter (vs. subequal or longer) than inter-band spaces. It can be distinguished from C. ziegleri by its much smaller size (maximal known SVL 56.3 vs. 93 mm), its lower number of enlarged femoral scales on each side (4 vs. 8–10), the absence (vs. presence) of femoral pores in males, its much narrower dorsal bands, and its highly irregular (vs. regular) dark tail bands with band length much shorter than intervals (vs. subequal). 
Comment 
EtymologyThe specific epithet honors Nguyen Ngoc Sang (Institute of Tropical Biology, Ho Chi Minh City) for his contributions to the herpetology of Vietnam and his benchmark works on taxonomy and diversity of the genus Cyrtodactylus in Vietnam (Nguyen et al. 2013, 2014). 
References
  • Bobrov V.V., Semenov D.V. 2008. Lizards of Vietnam [in Russian]. Moscow, 236 pp.
  • NAZAROV, ROMAN; NIKOLAY A. POYARKOV, NIKOLAI L. ORLOV, TRUNG MY PHUNG, TAO THIEN NGUYEN, DUC MINH HOANG & THOMAS ZIEGLER 2012. Two new cryptic species of the Cyrtodactylus irregularis complex (Squamata: Gekkonidae) from southern Vietnam. Zootaxa 3302: 1–24 - get paper here
  • NGUYEN, SANG NGOC; JUN-XIAO YANG, THANH-NGAN THI LE, LUAN THANH NGUYEN, NIKOLAI L. ORLOV, CHUNG VAN HOANG, TRUONG QUANG NGUYEN, JIE-QIONG JIN, DING-QI RAO, THAO NGOC HOANG, JING CHE, ROBERT W. MURPHY, YA-PING ZHANG 2014. DNA barcoding of Vietnamese bent-toed geckos (Squamata: Gekkonidae: Cyrtodactylus) and the description of a new species. Zootaxa 3784 (1): 048–066 - get paper here
  • NGUYEN, SANG NGOC; THANH-NGAN THI LE, THI ANH DAO TRAN, NIKOLAI L. ORLOV, AMY LATHROP, ROSS D. MACCULLOCH, THUY-DUONG THI LE, JIE-QIONG JIN, LUAN THANH NGUYEN, TAO THIEN NGUYEN, DAT DUC HOANG, JING CHE, ROBERT W. MURPHY & YA-PING ZHANG 2013. Phylogeny of the Cyrtodactylus irregularis species complex (Squamata: Gekkonidae) from Vietnam with the description of two new species. Zootaxa 3737 (4): 399–414 - get paper here
  • Nguyen, Sang Ngoc;Wei-Wei Zhou, Thanh-Ngan Thi Le, Anh-Dao Thi Tran, Jie-Qiong Jin,Ba Dinh Vo, Luan Thanh Nguyen,Tao Thien Nguyen,Truong Quang Nguyen,Dat Duc Hoang, Nikolai L. Orlov,Jing Che, Robert Murphy,Ya-Ping Zhang 2017. Cytonuclear Discordance, Cryptic Diversity, Complex Histories, and Conservation Needs in Vietnamese Bent-toed Geckos of the Cyrtodactylus irregularis Species Complex Russ. J. Herpetol. 24 (2): 133-154 - get paper here
  • NGUYEN, TRUONG QUANG; ANH VAN PHAM, THOMAS ZIEGLER, HANH THI NGO, MINH DUC LE 2017. A new species of Cyrtodactylus (Squamata: Gekkonidae) and the first record of C. otai from Son La Province, Vietnam Zootaxa 4341 (1): 25-40 - get paper here
  • PAUWELS, OLIVIER S. G.; ROMAN A. NAZAROV, VLADIMIR V. BOBROV & NIKOLAY A. POYARKOV 2018. Taxonomic status of two populations of Bent-toed Geckos of the Cyrtodactylus irregularis complex (Squamata: Gekkonidae) with description of a new species from Nui Chua National Park, southern Vietnam Zootaxa 4403 (2): 307-335
 
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