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Achalinus tranganensis LUU, ZIEGLER, HA, LO, HOANG, NGO, LE, TRAN & NGUYEN, 2020

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Higher TaxaXenodermidae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Trang An Burrowing Snake
Vietnamese: Rắn xe điếu tràng an 
SynonymAchalinus tranganensis LUU, ZIEGLER, HA, LO, HOANG, NGO, LE, TRAN & NGUYEN 2020 
DistributionN Vietnam (Ninh Binh)

Type locality: limestone forest (20°15.266’N, 105°53.677’E, 9 m a.s.l.), near Tran Temple, Trang An Landscape Complex, Ninh Binh Province, northern Vietnam  
TypesHolotype. VNUF R.2018.21 (field number TA.18.21), adult female, collected by V.Q. Luu, O.V. Lo, N.T. Nguyen on 31 May 2018. 
DiagnosisDiagnosis: Achalinus tranganensis sp. nov is characterized by the following combination of morphological characters: 1) maxillary teeth 29; 2) suture between the internasals distinctly longer than that between the prefron- tals; 3) loreal distinctly wider than high, extending from the nasal to the eye; 4) dorsal scales in 25–23–23 rows, keeled; 5) two pairs of prefrontals; 6) supralabials six; 7) infralabials six; 8) temporals 2+3, the two anterior tempo- rals in contact with eye; 9) ventrals 171; 10) subcaudals 73+, entire; 11) cloacal entire; 12) dorsum in preservative reddish to greyish brown above; 13) the lower part of head side and chin region somewhat paler than remaining head; 14) venter greyish cream, with the anterior region of each ventral and subcaudal somewhat darker. 
CommentSympatry: Lycodon futsingensis, L. subcinctus, Oligodon chinensis.

Abundance: only known from a single specimen (2023). 
EtymologyNamed after its type locality, the Trang An Landscape Complex, where the new Achalinus was discovered. 
  • LI, K., WU, Y. Y., XU, R. Y., ZHU, F., REN, J. L., GUO, P., & DONG, B. J. 2021. A new species of the Achalinus rufescens complex (Xenodermidae: Achalinus) from Fujian Province, China. Zootaxa 5026 (2): 239-254 - get paper here
  • LUU, VINH QUANG; THOMAS ZIEGLER, NGHIA VAN HA, OANH VAN LO, TUOI THI HOANG, HANH THI NGO, MINH DUC LE, DUNG HOANG TRAN, TRUONG QUANG NGUYEN 2020. A new species of Achalinus (Squamata: Xenodermidae) from Trang An Landscape Complex, Ninh Binh Province, Vietnam. Zootaxa 4877 (1): 174–184 - get paper here
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