Hypsiglena cf. chlorophaea — undescribed species
The white nape is a feature apparently found only on this yet-to-be described species of nightsnake. However, it is not present on all individuals (such as the first one pictured above).
- Daniel G. Mulcahy, 2008. Phylogeography and species boundaries of the western North American Night snake (Hypsiglena torquata): Revisiting the subspecies concept
- 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
- Rorabaugh, J.C., Lemos-Espinal, J.A. 2016. A Field Guide to the Amphibians and Reptiles of Sonora, Mexico