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Isanophis boonsongi (TAYLOR & ELBEL, 1958)

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Higher TaxaColubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Boomsong’s Stream Snake
G: Boonsongs Bachnatter 
SynonymParahelicops boonsongi TAYLOR & ELBEL 1958: 1156
Opisthotropis boonsongi — BROWN & LEVITON 1961
Parahelicops boonsongi — COX 1991
Opisthotropis boonsongi — COX 1995
Opisthotropis boonsongi — VAN DIJK et al. 1998: 48
Opisthotrophis [sic] boonsongi — CHAN-ARD et al. 1999: 35
Parahelicops boonsongi — DAVID et al. 2004
Opisthotrophis boonsongi — DAVID et al. 2011
Parahelicops boonsongi — WALLACH et al. 2014: 520
Parahelicops boonsongi — CHAN-ARD et al. 2015: 226
Isanophis boonsongi — DAVID et al. 2015 
DistributionNE Thailand

Type locality: Phu Lang (mountain), Ban Khok (subvillage), Na Phung (village), Dan Sai (district), Loei (province), Thailand [after BROWN & LEVITON 1961]  
TypesHolotype: FMNH 135328; formerly personal collection of E. H. Taylor (fide BROWN & LEVITON 1961) 
DiagnosisDiagnosis (genus): A genus of snake of the family Natricidae characterized by (1) posterior maxillary teeth strongly enlarged, (2) nostrils dorsolateral and directed obliquely upwards; (3) eye diameter slightly greater than the eye- nostril distance and distinctly greater than the distance between its lower margin and the margin of the lip, (4) pupil round, (5) dorsal scales strongly keeled with a thick median keel throughout the body, (6) body stout, (7) head strongly distinct from neck, and (8) prefrontal scale single [DAVID et al. 2015]. 
CommentHabitat: aquatic

Behavior: nocturnal

Type species: Parahelicops boonsongi TAYLOR & ELBEL 1958: 1156 is the type species of the genus Isanophis DAVID et al. 2015.

Abundance: This species has been known from only the holotype until Cox (1995) recorded two additional specimens about 40 km east of the type locality. One of the specimens was depicted in Cox et al. (1998, 2012). 
EtymologyNamed after Dr. Boonsong Lekagul who has so generously provided the University of Kansas with Thailand amphibians and reptiles.

The generic nomen Isanophis is derived from the word “Isan”, the Thai name of the north-eastern region of Thailand, and from the Greek word ophis, meaning “snake”. It describes the limited known range of this genus. This generic nomen is masculine in gender. 
  • Beolens, Bo; Michael Watkins, and Michael Grayson 2011. The Eponym Dictionary of Reptiles. Johns Hopkins University Press, Baltimore, USA - get paper here
  • Brown,W.C. & Leviton,A.E. 1961. Discovery of the snake genus Opisthotropis in the Philippine Islands, with description of a new species. Occasional Papers of the Natural History Museum of Stanford University (8): 1-11
  • Chan-ard, T., Parr, J.W.K. & Nabhitabhata, J. 2015. A field guide to the reptiles of Thailand. Oxford University Press, NY, 352 pp. [see book reviews by Pauwels & Grismer 2015 and Hikida 2015 for corrections] - get paper here
  • Cox, Merel J. 1991. The Snakes of Thailand and their Husbandry. Krieger, Malabar, FL, xxxviii + 526 pp.
  • Cox, Merel J. 1995. Opisthotrophis boonsongi. Herpetological Review 26 (3): 157 - get paper here
  • Cox, Merel J.; Van Dijk, Peter Paul; Jarujin Nabhitabhata & Thirakhupt,Kumthorn 1998. A Photographic Guide to Snakes and Other Reptiles of Peninsular Malaysia, Singapore and Thailand. Ralph Curtis Publishing, 144 pp.
  • DAVID, PATRICK; CUONG THE PHAM, TRUONG QUANG NGUYEN & THOMAS ZIEGLER 2011. A new species of the genus Opisthotropis Günther, 1872 (Squamata: Natricidae) from the highlands of Kon Tum Province, Vietnam. Zootaxa 2758: 43–56 - get paper here
  • DAVID, PATRICK; OLIVIER S. G. PAUWELS, TRUONG QUANG NGUYEN & GERNOT VOGEL 2015. On the taxonomic status of the Thai endemic freshwater snake Parahelicops boonsongi, with the erection of a new genus (Squamata: Natricidae). Zootaxa 3948 (2): 203–217 - get paper here
  • REN, Jinlong; Kai WANG, Peng GUO, Yingyong WANG, Tao Thien NGUYEN, and Jiatang LI 2019. On the Generic Taxonomy of Opisthotropis balteata (Cope, 1895) (Squamata: Colubridae: Natricinae): Taxonomic Revision of Two Natricine Genera. Asian Herpetological Research 10 (2): 105–128; DOI: 10.16373/j.cnki.ahr.180091 - get paper here
  • Taylor, Edward H. & Elbel, Robert E. 1958. Contribution to the Herpetology of Thailand. Univ. Kansas Sci. Bull. 38 (13): 1033-1189 - get paper here
  • Taylor,E.H. 1965. The serpents of Thailand and adjacent waters. Univ. Kansas Sci. Bull. 45 (9): 609-1096 - get paper here
  • Wallach, Van; Kenneth L. Williams , Jeff Boundy 2014. Snakes of the World: A Catalogue of Living and Extinct Species. [type catalogue] Taylor and Francis, CRC Press, 1237 pp.
  • YANG, JIAN-HUAN; YIK-HEI SUNG & BOSCO PUI-LOK CHAN 2013. A new species of the genus Opisthotropis Günther, 1872 (Squamata: Colubridae: Natricinae) from Guangdong Province, China. Zootaxa 3646 (3): 289–296 - get paper here
  • YANG, JIAN-HUAN; YING-YONG WANG, BING ZHANG, MICHAEL WAI-NENG LAU & WEN-HAO CHOU 2011. Revision of the diagnostic characters of Opisthotropis maculosa Stuart and Chuaynkern, 2007 with notes on its distribution and variation, and a key to the genus Opisthotropis (Squamata: Natricidae). Zootaxa 2785: 61–68 - get paper here
  • Ziegler, Thomas; Patrick David, Vu Ngoc Thanh 2008. A new natricine snake of the genus Opisthotropis from Tam Dao, Vinh Phuc Province, northern Vietnam (Squamata, Colubridae). Zoosystematics and Evolution 84 (2): 197 -203 - get paper here
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