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Dibamus tropcentr KLIUKIN, VAN NGUYEN, LE, BRAGIN, TRAN, GORIN & POYARKOV, 2023

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Higher TaxaDibamidae, Sauria, Squamata (lizards)
Subspecies 
Common NamesE: Ninh Thuan Blind Skink
Russian: Ninthuanskaya cherveobraznaya yascheritsa
Vietnamese: Thằn lằn giun Ninh Thuận 
SynonymDibamus tropcentr KLIUKIN, VAN NGUYEN, LE, BRAGIN, TRAN, GORIN & POYARKOV 2023: 304
Dibamus tropcentr — KLIUKIN et al. 2024 
DistributionS Vietnam (Ninh Thuan)

Type locality: trail to Ao Ho Pond area, ca. 300 m from #702 road, Da Vach Mountain, Da Vach Peninsula, Nui Chua National Park, Thai An Village, Vinh Hai Commune, Ninh Hai District, Ninh Thuan Province, southern Vietnam (11.736°N, 109.213°E; elevation 200 m a.s.l.)  
Reproduction 
TypesHolotype. ZMMU Re-17443, Adult female; field tag NAP-13228) collected on January 7, 2023, at 08:30 h by N. A. Poyarkov and S. X. Le.
Paratypes. ZMMU Re-17444 (field tag NAP-13142 / VRTC.NC.053), adult male collected at the same locality as the holotype on September 10, 2022, by S. X. Le; ZMMU Re-17572 (field tag NAP-13530), ZMMU Re-17573 (field tag NAP-13531), and ZMMU Re-17574 (field tag NAP-13532), two adult females and one subadult female respectively, collected at the same locality as holotype on February 28, 2023, by N. A. Poyarkov and A. M. Bragin; and VRTC NAP-13639 (field tag NAP-13639) and ZMMU Re-17575 (field tag NAP-13712), adult female and adult male respectively, collected in the valley of Nuoc Ngot River (11.778°N, 109.176°E; elevation 280 m a.s.l.), ca. 3 km south-west from Nuoc Ngot Beach, on the territory of Nui Chua N.P., Thai An Village, Vinh Hai Commune, Ninh Hai District, Ninh Thuan Province, southern Vietnam, on February 7, 2023, by N. A. Poyarkov and A. M. Bragin. 
DiagnosisDiagnosis: The new species is assigned to Dibamus based on the following morphological characters: (1) worm-like body shape, fore limbs absent, hind limbs rudimentary, present only in males, forming flap-like structures located near the base of the tail above the vent; (2) eyes rudimentary, completely covered by scales; (3) external ear openings absent; (4) enlarged plate-like scales on the head; (5) postorbital bone absent; (6) epipterygoid absent; (7) temporal bone absent; (8) rib of last presacral vertebra absent; (9) tail length less than 34.0% of SVL; (10) subcaudal scales in females reduced to 64; and (11) postsacral vertebrae reduced to 36 in a single male (Greer 1985). Dibamus tropcentr sp. nov. can be distinguished from all other congeners by the following combination of morphological characters: (1) maximum SVL of 96.2 mm; (2) tail comparatively long, TL comprising 24.4–30.0% of SVL; (3) labial, nasal and medial rostral sutures present but incomplete, lateral rostral sutures completely absent; (4) two postocular scales; (5) three to four scales bordering the posteromedial edge of the first infralabial; (6) the medial sublabial scale not enlarged; (7) 19–21 midbody scale rows; (8) 23–24 transverse scale rows just posterior to head; (9) 18–19 transverse scale rows just anterior to vent; (10) 198–227 ventral scales; (11) 64–65 subcaudal scales; (12) relative size of frontal to frontonasal 88.5–120.5%; (13) relative size of interparietal to surrounding scales 91.3–128.6%; and (14) the light colored band on the body generally present. (Kliukin et al. 2023)


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Comment 
EtymologyNamed after the Joint Vietnam - Russia Tropical Science and Technology Research Centre (VRTC). This international organization has been conducting research on ecology and biodiversity of Vietnam for over 35 years (1989–2023). 
References
  • KLIUKIN, N. S., VAN NGUYEN, T. A. N., LE, S. X., BRAGIN, A. M., TRAN, T. T. V., GORIN, V. A., & POYARKOV, N. A. 2023. A new species of the genus Dibamus Duméril & Bibron, 1839 (Squamata: Dibamidae) from the driest and hottest place of Vietnam. Zootaxa 5380 (4): 301-320 - get paper here
  • KLIUKIN, NIKITA S.; ANDREY M. BRAGIN; TAN VAN NGUYEN; SON XUAN LE; TIN TRONG VO TRAN; VLADISLAV A. GORIN & NIKOLAY A. POYARKOV 2024. Another new species of Dibamus Duméril & Bibron, 1839 (Squamata: Dibamidae) from Nui Chua National Park, Ninh Thuan Province, Vietnam Zootaxa 5406 (1): 087–104 - get paper here
 
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