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Xenoxybelis boulengeri (PROCTER, 1923)

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Southern Sharpnose Snake 
SynonymOxybelis boulengeri PROCTER 1923: 1062
Oxybelis boulengeri — KEISER 1989
Oxybelis boulengeri — DUELLMAN 1991
Xenoxybelis boulengeri — MACHADO 1993: 99
Oxybelis boulengeri — LEHR 2002: 205
Xenoxybelis boulengeri — COSTA PRUDENTE et al. 2008
Philodryas boulengeri — ZAHER et al. 2009 (by implication)
Philodryas georgeboulengeri GRAZZIOTIN, et al. 2012 (nom. nov.)
Philodryas georgeboulengeri — WALLACH et al. 2014: 550
Philodryas georgeboulengeri — NOGUEIRA et al. 2019
Xenoxybelis boulengeri — ARREDONDO et al. 2020
Xenoxybelis boulengeri — MELO-SAMPAIO et al. 2020 
DistributionBolivia, Peru, Brazil (Amazonas)

Type locality: Trinidad, River Mamore, Bolivia.  
TypesHolotype: BMNH 1946.1.9.86 
CommentHas been considered as a synonym of X. argenteus by most authors but revalidated by KEISER (1989).

According to Article 53.3 of the Code, Philodryas boulengeri Werner 1909, a junior synonym of Philodryas mattogrossensis Koslowsky, 1898 and Philodryas boulengeri (Procter, 1923) are secondary homonyms because both meet the criterion of availability (see Articles 10.6 and 11 of the Code). According to the Principle of Priority (Article 23), Philodryas boulengeri (Procter, 1923) is the junior secondary homonym. Considering that both names do not fall into any of the exceptions listed in Articles 23.7.3, 23.8 and 23.9, and that Philodryas boulengeri (Procter, 1923) has no known available and potentially valid junior synonyms, its specific epithet must be replaced by a new substitution name (Articles 57.3.1. and 59.1) [GRAZZIOTIN et al. 2012]. The homonymy was resolved by the resurrection of Xenoxybelis by Arredondo et al. 2020 and MELO-SAMPAIO et al. 2020, hence the name returns to boulengeri.

Habitat: fully arboreal (Harrington et al. 2018). 
EtymologyNamed after George Albert Boulenger (1858-1937), herpetologist at the British Museum of Natural History, London. 
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