{{Short description|Species of snake}} {{speciesbox | name = | image = | status = DD | status_system = IUCN3.1 | status_ref = <ref name="iucn status 14 November 2021">{{cite iucn |author=Chan-Ard, T. |date=2012 |title=''Isanophis boonsongi'' |volume=2012 |article-number=e.T41214A2951873 |doi=10.2305/IUCN.UK.2012-1.RLTS.T41214A2951873.en |access-date=14 November 2021}}</ref> | display_parents = 2 | genus = Isanophis | parent_authority = David, Pauwels, T.Q. Nguyen & G. Vogel, 2015 | species = boonsongi | authority = (Taylor & Elbel, 1958) | synonyms = *''Parahelicops boonsongi'' <br />{{small|Taylor & Elbel, 1958}} *''Opisthotropis boonsongi'' <br />{{small|— W. Brown & Leviton, 1961}} *''Opisthotrophis'' [sic] '' boonsongi'' <br />{{small|— Chan-ard et al., 1999}} *''Isanophis boonsongi'' <br />{{small|— David et al., 2015}} | synonyms_ref = <ref name=rdb>{{NRDB species|genus=Isanophis|species=boonsongi|accessdate=5 December 2016}}</ref> }}

'''Boonsong's stream snake''' ('''''Isanophis boonsongi'''''),<ref name=EDR/> also known as '''Boonsong's keelback''' and commonly misspelled as '''Boomsong''',<ref name="iucn status 14 November 2021" /> is a species of snake in the family Colubridae, subfamily Natricinae (keelbacks). It is monotypic in the genus '''''Isanophis'''''.<ref name=rdb/> The species is endemic to Thailand.

==Taxonomy== Boonsong's stream snake is a rare snake only known from three specimens. It was originally described as ''Parahelicops boonsongi'' in 1958 on the basis of a single specimen<ref name=taylor1958>{{Cite journal|author=Taylor EH, Elbel RE|date=1958|title=Contribution to the Herpetology of Thailand|url=https://www.biodiversitylibrary.org/part/10972|journal=University of Kansas Science Bulletin|volume=38|pages=1033–1189|doi=10.5962/bhl.part.10972|doi-access=free}} (''Parahelicops boonsongi'', new species, pp.&nbsp;1156–1159, Figure 31).</ref> and has since been argued by different authors to fall within either ''Parahelicops'' or ''Opisthotropis''.<ref name=cox1995>Cox, Merel J. (1995). "''Opisthotrophis boonsongi'' ". ''Herpetological Review'' '''26''' (3): 157.</ref><ref name=rdb/> Most recently, a 2015 study described a new genus, ''Isanophis'', to accommodate this species on the basis of morphological differences in the teeth size, eye size and placement, pupil shape, keel shape, gross body morphology, and presence of a single prefrontal scale.<ref name=david2015>David, Patrick; Pauwels, Olivier S. G.; Nguyen, Truong Quang; Vogel, Gernot (2015). "On the taxonomic status of the Thai endemic freshwater snake ''Parahelicops boonsongi'', with the erection of a new genus". ''Zootaxa'' '''3948''' (2): 203-217. (''Isanophis'', new genus, pp.&nbsp;205–206; ''Isanophis boonsongi'', new combination, pp.&nbsp;206–208, Figure 1).</ref>

Higher taxonomy of ''Isanophis'' is variable, with some authors recognizing Natricidae as its own family<ref name=david2015/> and others treating it as a subfamily (Natricinae) of the family Colubridae.<ref name=rdb/>

==Geographic range== ''I. boonsongi'' is known only from Loei Province in northeastern Thailand although it may occur in Laos, southern China, and Vietnam.<ref name=david2015/>

==Conservation status== As it is only known from three specimens, ''I. boonsongi'' is treated as Data Deficient in The IUCN Red List of Threatened Species.<ref name="iucn status 14 November 2021" />

==Biology== ''I. boonsongi'' is a nocturnal snake found in sub-montane forests and may be aquatic or semi-aquatic, feeding on frogs and fishes.<ref name="iucn status 14 November 2021" /><ref name=rdb/>

==Etymology== The genus name ''Isanophis'' refers to Isan, a northeastern region of Thailand where it has been found, and ''ophis'' (Greek), meaning snake.<ref name=david2015/> The specific name, ''boonsongi'', commemorates Thai zoologist and conservationist Dr. Boonsong Lekagul.<ref name=EDR>Beolens B, Watkins M, Grayson M (2011). ''The Eponym Dictionary of Reptiles''. Baltimore: Johns Hopkins University Press. xiii + 296 pp. {{ISBN|978-1-4214-0135-5}}. ("Boonsong's Stream Snake, ''Opisthotropis boonsongi'' ", p. 31).</ref>

==References== {{Reflist}}

{{Taxonbar|from1=Q28319645|from2=Q28319651|from3=Q2381138}}

Category:Natricinae Category:Snakes of Thailand Category:Endemic fauna of Thailand Category:Taxa named by Edward Harrison Taylor Category:Reptiles described in 1958 Category:Taxonomy articles created by Polbot