Cyrtodactylus sangi PAUWELS, NAZAROV, BOBROV & POYARKOV, 2018
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Cyrtodactylus sangi
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| Higher Taxa | Gekkonidae, Gekkota, Sauria, Squamata (lizards: geckos) |
| Subspecies | |
| Common Names | E: 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 |
| Synonym | Cyrtodactylus 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 |
| Distribution | S 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 | |
| Types | Holotype: 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. |
| Diagnosis | Diagnosis. 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 | |
| Etymology | The 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). |
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