Hypsiglena unaocularus Tanner, 1946:74

Clarión nightsnake



Taxonomy & Nomenclature

Synonym/s: Hypsiglena ochrorhyncha unaocularus Tanner, 1946:74


Conservation Status

Last record: 1936?

Rediscovered in May 2013?



Clarión Island (=Isla Clarión), Mexico


Biology & Ecology




Holotype: AMNH R62756 (Mulcahy et al., 2014)



Photos of live individuals can be seen in (Mulcahy et al., 2014; González-Sánchez et al., 2023).



Original scientific description:

Tanner, W. W. (1946). A taxonomic study of the genus Hypsiglena. Great Basin Naturalist 5(3-4): 25-92 [printed date: 1944].


Other references:

González-Sánchez, Victor Hugo et al. (2023). The Herpetofauna of the Insular Systems of Mexico. Diversity 15(8): 921.

Johnson, J., Wilson, L., Mata-Silva, V., García-Padilla, E. and DeSantis, D. (2017). The endemic herpetofauna of Mexico: Organisms of global significance in severe peril. Mesoamerican Herpetol. 4: 544–620.

Mulcahy, D. G., Martínez-Gómez, J. E., Aguirre-León, G., Cervantes-Pasqualli, J. A. and Zug, G. R. (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.

Wallach, V., Williams, K. L., Boundy, J. (2014). Snakes of the World: A Catalogue of Living and Extinct Species. Boca Raton, Florida: CRC Press.


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