Synonyms

• Lamprosoma Hallowell, 1856: 310 [preoccupied by Lamprosoma Kirby, 1818]
  • Type species: Rhinostoma occipitale Hallowell, 1854, by original designation and monotypy.

• Chionactis Cope, 1860: 241 [replacement name]
  • Type species: Rhinostoma occipitale Hallowell, 1854, by original designation and monotypy.

• Chilomeniscus Cope, 1860: 339
  • Type species: Chilomeniscus stramineus Cope, 1860, by monotypy.

Primary references

• Baird, S.F. & Girard, C. 1853. Catalogue of North American Reptiles in the Museum of the Smithsonian Institution. Part 1.–Serpents. Smithsonian Institution: Washington. xvi + 172 pp. BHL Reference page. 
• Hallowell, E. [1856] 1857. Description of a new genus of colubriform serpents from California. Proceedings of the Academy of Natural Sciences of Philadelphia 8(6): 310–311. BHL
• Cope, E.D. 1860. Catalogue of the Colubridae in the Museum of the Academy of Natural Sciences of Philadelphia, with notes and descriptions of new species. Part 2. Proceedings of the Academy of Natural Sciences of Philadelphia 12: 241–266. BHL Reference page. 
• Cope, E.D. 1860. Notes and descriptions of new and little known species of American reptiles. Proceedings of the Academy of Natural Sciences of Philadelphia 12: 339–345. BHL Reference page. 

Additional references

• Cox, C.L., Rabosky, A.R.D., Reyes-Velasco, J., Ponce-Campos, P., Smith, E.N., Flores-Villela, O. & Campbell, J.A. 2012. Molecular systematics of the genus Sonora (Squamata: Colubridae) in central and western Mexico. Systematics and Biodiversity 10(1): 93–108. DOI: 10.1080/14772000.2012.666293 Reference page. 
• Wood, D.A., Fisher, R.N. & Vandergast, A.G. 2014. Fuzzy Boundaries: Color and Gene Flow Patterns among Parapatric Lineages of the Western Shovel-Nosed Snake and Taxonomic Implication. PLoS One 9(5): e97494. DOI: 10.1371/journal.pone.0097494 Reference page. 
• Cox, C.L., Rabosky, A.R.D., Holmes, I.A., Reyes-Velasco, J., Roelke, C.E., Smith, E.N., Flores-Villela, O., McGuire, J.A. & Campbell, J.A. 2018. Synopsis and taxonomic revision of three genera in the snake tribe Sonorini. Journal of Natural History 52(13–16): 945–988. DOI: 10.1080/00222933.2018.1449912 Reference page. 

Links

• Uetz, P. & Hallermann, J. 2022. Sonora . The Reptile Database. Accessed on 11 March 2022.