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Hypsiglena unaocularus TANNER, 1946

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Islas Revillagigedo Nightsnake
S: Nocturna de la Isla Clarión 
SynonymHypsiglena ochrorhyncha unaocularus TANNER 1946: 74 (1944)
Hypsiglena ochrorhyncha unaocularis — MULCAHY 2008
Hypsiglena unaocularus — MULCAHY et al. 2014
Hypsiglena unaocularis — JOHNSON et al. 2017
Hypsiglena ochrorhyncha unaocularus — LINDKEN et al. 2024 
DistributionMexico (Clarion Island, Islas Revillagigedo, Colima)

Type locality: Clarion Island, Mexico.  
Reproductionoviparous. 
TypesHolotype: AMNH 62756, adult male 
DiagnosisDiagnosis: Tanner 1946: 76 (as H. ochrorhynchus unaocularus) 
CommentSynonymy: Listed as synonym of Hypsiglena ochrorhyncha by WALLACH et al. 2014: 344. 
EtymologyFrom the Latin oculāris meaning eye and ūnī meaning one in reference to its single postoccular scale. 
References
  • Heimes, P. 2016. Snakes of Mexico. Chimaira, Frankfurt, 572 pp
  • Johnson, J. D., L. D. Wilson, V. Mata-Silva, E. García-Padilla, and D. L. DeSantis. 2017. The endemic herpetofauna of Mexico: organisms of global significance in severe peril. Mesoamerican Herpetology 4 (3): 544–620 - get paper here
  • Lemos-Espinal JA, Smith GR, Pierce LJS, Painter CW 2020. The amphibians and reptiles of Colima, Mexico, with a summary of their conservation status. ZooKeys 927: 99-125 - get paper here
  • Lindken T.; Anderson, C. V., Ariano-Sánchez, D., Barki, G., Biggs, C., Bowles, P., Chaitanya, R., Cronin, D. T., Jähnig, S. C., Jeschke, J. M., Kennerley, R. J., Lacher, T. E. Jr., Luedtke, J. A., Liu, C., Long, B., Mallon, D., Martin, G. M., Meiri, 2024. What factors influence the rediscovery of lost tetrapod species? Global Change Biology, 30: 1-18 - get paper here
  • 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
 
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