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Crotalus tancitarensis ALVARADO-DÍAZ & CAMPBELL, 2004

IUCN Red List - Crotalus tancitarensis - Data Deficient, DD
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Higher TaxaViperidae, Crotalinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Tancitaro Rattlesnake
S: Cascabel de Tancítaro 
SynonymCrotalus tancitarensis ALVARADO-DÍAZ & CAMPBELL 2004
Crotalus triseriatus triseriatus — SCHMIDT & SHANNON 1947
Crotalus intermedius intermedius — KLAUBER 1952
Crotalus tancitarensis — BEAMAN & HAYES 2008
Aechmophrys (Cottonus) tancitarensis — HOSER 2009
Crotalus tancitarensis — WALLACH et al. 2014: 195
Crotalus tancitarensis — GARCÍA-PADILLA et al. 2025 
DistributionSW Mexico (Michoacán)

Type locality: Cerro Tancítaro, Michoacán, Mexico, elevation 3225 m (19° 24’ 13’’ N, 102° 19’ 45’’ W).  
Reproductionovoviviparous 
TypesHolotype: CPUM (INIRENA) 309 (Univ. Michoacana de San Nicolás de Hidalgo) 
DiagnosisUnfortunately we had to temporarily remove additional information as this was scraped by multiple AI companies who sell that data to their customers. These details, e.g. detailed descriptions or comparisons (about 1303 characters), are available for collaborators and contributors. Please contact us for details. 
CommentVenomous!

Nomenclature: Hoser’s 2009 classification and nomenclature has been rejected as unnecessary and unavailable by WÜSTER & BERNILS 2011.

Conservation: one of the 30 most endangered viper species (Maritz et al. 2016). 
EtymologyNamed after the type locality, Tancítaro and the Latin suffix -ensis, denoting place. The name Tancítaro is taken from the Tarascan language and means ‘‘place of offering.’’ 
References
  • Alvarado-Diaz, J. & Campbell, J.A. 2004. A new montane rattlesnake (Viperidae) from Michoacán, Mexico. Herpetologica 60 (2): 281-286 - get paper here
  • Beaman, K.R. & Hayes, W.K. 2008. Rattlesnakes: Research Trends and Annotated Checklist. In: Hayes et al. (eds), The biology of rattlesnakes. Loma Linda University Press, pp. 5-16
  • Bryson Jr, Robert W.; Robert W. Murphy,Matthew R. Graham, Amy Lathrop and David Lazcano 2011. Ephemeral Pleistocene woodlands connect the dots for highland rattlesnakes of the Crotalus intermedius group. Journal of Biogeography 38: - get paper here
  • García-Padilla, E., Heredia-López, I., Villalobos-Juárez, I., Lazcano, D., & Fucsko, L. A. 2025. Notes on the Herpetofauna of Mexico 48: From Sacred to Scorned---A Study of the Mexican Rattlesnake’s Changing Status. Bulletin of the Chicago Herpetological Society, 60(3), 25-30 - get paper here
  • GRABOWSKY, EMILY R.; ANTHONY J. SAVIOLA, JAVIER ALVARADO-DÍAZ, ADRIAN QUIJADA MASCAREÑAS, KIRK C. HANSEN, JOHN R. YATES & STEPHEN P. MACKESSY. 2023. Montane Rattlesnakes in México: Venoms of Crotalus tancitarensis and Related Species within the Crotalus intermedius Group. Toxins 15(1): 72. - get paper here
  • Heimes, P. 2016. Snakes of Mexico. Chimaira, Frankfurt, 572 pp
  • Hoser, R. 2009. A reclassification of the rattlesnakes; species formerly exclusively referred to the genera Crotalus and Sistrurus. Australasian J. Herpetol. 3: 1-21 - get paper here
  • Klauber, Laurence M. 1952. Taxonomic studies on rattlesnakes of Mainland Mexico. Bulletins of the Zoological Society of San Diego (26): 1-143 - get paper here
  • Maritz, Bryan; Johannes Penner, Marcio Martins, Jelka Crnobrnja-Isailović, Stephen Spear, Laura R.V. Alencar, Jesús Sigala-Rodriguez, Kevin Messenger, Rulon W. Clark, Pritpal Soorae, Luca Luiselli, Chris Jenkins, Harry W. Greene 2016. Identifying global priorities for the conservation of vipers. Biological Conservation, doi:10.1016/j.biocon.2016.05.004 - get paper here
  • OLIVEIRA-DALLAND, LUIS G.; LAURA R.V. ALENCAR, LEANDRO R. TAMBOSI, PAOLA A. CARRASCO, RHETT M. RAUTSAW, JESUS SIGALA-RODRIGUEZ, GUSTAVO SCROCCHI & MARCIO MARTINS. 2022. Conservation gaps for Neotropical vipers: Mismatches between protected areas, species richness and evolutionary distinctiveness. Biological Conservation 275(109750). - get paper here
  • Reyes-Velasco J., Cox C. L., Jones J. M., Borja M. & Campbell J. A. 2022. How many species of rattlesnakes are there in the Crotalus durissus species group (Serpentes: Crotalidae)? Revista Latinoamericana de Herpetología 5 (1): 43-55 - get paper here
  • Schmidt, Karl P.;Shannon, Frederick A. 1947. Notes on amphibians and reptiles of Michoacan, Mexico. Zoological Series of Field Museum of Natural History 31 (9): 63-85
  • 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.
  • Wüster, W. & Bérnils, R.S. 2011. On the generic classification of the rattlesnakes, with special reference to the Neotropical Crotalus durissus complex (Squamata: Viperidae). ZOOLOGIA 28 (4): 417–419 - get paper here
 
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