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Oligodon culaochamensis NGUYEN, NGUYEN, NGUYEN, PHAN, JIANG & MURPHY, 2017

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Higher TaxaColubridae, Colubrinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) 
Common Names 
SynonymOligodon culaochamensis NGUYEN, NGUYEN, NGUYEN, PHAN, JIANG & MURPHY 2017 
DistributionVietnam (Quang Nam)

Type locality: Hon Lao, Cu Lao Cham Islands, Quang Nam Province, Vietnam; 15°56’38”N, 108°30’44”E; elevation 41 m elevation  
TypesHolotype: ITBCZ 5646, adult male, collected by L.T. Nguyen, V.D.H. Nguyen, and S.N. Nguyen on 27 July 2016. Paratypes. Five specimens, also collected from Hon Lao, Cu Lao Cham Islands. ITBCZ 5618, adult females, collected on 21 July 2016, coordinates 15°56’27”N, 108°31’13”E; elevation 106 m a.s.l.; ITBCZ 5631, adult male, collected on 24 June 2016, coordinates 15°56’40”N, 108°30’44”E; elevation 68 m a.s.l. by L.T. Nguyen, V.D.H. Nguyen, and S.N. Nguyen; ITBCZ 5655–6, two adult females, and ITBCZ 5658, a juvenile, collected in 2012 by L.T. Nguyen and H.T. Phan. (Figs. 4 & 5) 
DiagnosisDiagnosis. Oligodon culaochamensis sp. nov. is distinguished from its congeners by a combination of the following morphological characters: (1) medium size in adults (TL ≤ 582 mm); (2) 17 or 19 dorsal scale rows at neck and midbody and 15 or 17 rows before vent; (3) LaL/TL ratio 0.218–0.219 in males, 0.166–0.169 in females; (4) ventrals 167–169 in males and 179–182 in females; (5) subcaudals 63–66 in males and 51–52 in females; (6) presubocular present; (7) 8 supralabials, fourth and fifth entering orbit; (9) 9–10 maxillary teeth, posterior three enlarged; (10) nasal divided; (11) temporal streak absent; (12) long and deeply forked hemipenes, extending to 20th subcaudal, without spines and papillae but with a prominent diagonal ridge, oblique flounces and distal calyces; (13) cloacal plate undivided; (14) 10–11+3–4 dorsal blotches; and (15) vertebral stripe on tail and anterior part of body. See Nguyen et al. 2017 for detailed comparisons.
CommentHabitat: All specimens were collected at night and on the ground in dry primary forests or plantations, usually near the bank of small streams. 
EtymologyThe specific epithet culaochamensis is derived from Cu Lao Cham Islands, where the new species was discovered. 
  • NGUYEN, SANG NGOC; LUAN THANH NGUYEN, VU DANG HOANG NGUYEN, HOA THI PHAN, KE JIANG & ROBERT W. MURPHY 2017. A new species of the genus Oligodon Fitzinger, 1826 (Squamata: Colubridae) from Cu Lao Cham Islands, central Vietnam Zootaxa 4286 (3): 333–346
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