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Hypsiglena affinis BOULENGER, 1894

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Rio Grande de Santiago Nightsnake
S: Nocturna de Boulenger 
SynonymHypsiglena torquata affinis BOULENGER 1894
Hypsiglena affinis — TANNER 1946: 46 (1944)
Hypsiglena affinis — MULCAHY 2008
Hypsiglena affinis — WALLACH et al. 2014: 343 
DistributionMexico (Jalisco, Zacatecas, Nayarit)

Type locality: Zacatecas, Jalisco  
TypesHolotype: BMNH 1946.1.1.21-23 
DiagnosisDiagnosis: A Hypsiglena with only one preocular, seven labials, and only 19 dorsal rows of scales (Tanner 1946: 47). 
  • Bañuelos-Alamillo, Jorge A. and Rubén Alonso Carbajal-Márquez. 2016. Distribution Notes. Hypsiglena affinis Boulenger, 1894. Mesoamerican Herpetology 3 (1): 198 - get paper here
  • Boulenger, George A. 1894. Catalogue of the snakes in the British Museum (Natural History). Volume II., Containing the Conclusion of the Colubridæ Aglyphæ. British Mus. (Nat. Hist.), London, xi, 382 pp. - get paper here
  • Heimes, P. 2016. Snakes of Mexico. Chimaira, Frankfurt, 572 pp
  • Mulcahy DG, Martínez-Gómez JE, Aguirre-León G, Cervantes-Pasqualli JA, Zug GR 2014. Rediscovery of an Endemic Vertebrate from the Remote Islas Revillagigedo in the Eastern Pacific Ocean: The Clarión Nightsnake Lost and Found. PLoS One 9 (5): e97682. doi:10.1371/journal.pone.0097682 - get paper here
  • Mulcahy, Daniel G. 2008. Phylogeography and species boundaries of the western North American Nightsnake (Hypsiglena torquata): Revisiting the subspecies concept. Molecular Phylogenetics and Evolution 46 (3): 1095-1115 - get paper here
  • Tanner, W. W. 1946. A taxonomic study of the genus Hypsiglena. Great Basin Naturalist 5 (3-4): 25-92 [1944] - 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.
  • Woolrich-Piña, Guillermo A, Paulino Ponce-Campos, Jesús Loc-Barragán, Juan Pablo Ramírez-Silva, Vicente Mata-Silva, Jerry D. Johnson, Elí García-Padilla and Larry David Wilson. 2016. The herpetofauna of Nayarit, Mexico: composition, distribution, and conservation status. Mesoamerican Herpetology 3 (2): 376-448 - get paper here
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