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Crotalus transversus TAYLOR, 1944

IUCN Red List - Crotalus transversus - Least Concern, LC
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Higher TaxaViperidae, Crotalinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Cross-banded Mountain Rattlesnake
S: Cascabel Bandeada de Montaña 
SynonymCrotalus transversus TAYLOR 1944
Crotalus transversus — KLAUBER 1952: 16
Crotalus transversus — LINER 1994
Crotalus transversus — MCDIARMID, CAMPBELL & TOURÉ 1999: 296
Crotalus transversus — BEAMAN & HAYES 2008
Aechmophrys (Cottonus) transversus — HOSER 2009
Crotalus transversus — WALLACH et al. 2014: 195
Crotalus transversus — GARCÍA-PADILLA et al. 2025 
DistributionMexico (Sierra Ajusco, south of Mexico City, Distrito Federal; NW Morelos)

Type locality: “about 55 km SW México [City], neaer Tres Marias (Tres Cumbres), Morelos, elevation about 10,000 feet”. Corrected to „Laguna Zempoala, state of México“ by DAVIS & SMITH (1953)  
Reproductionovoviviparous 
TypesHolotype: FMNH 100129 
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 1954 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 Latin transversus, lying across/from side to side. [“...34-38 narrow, transverse black stripes on body...”]. 
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
  • Bryson, R.W. 2007. Fotopirsch auf Gebirgsklapperschlangen. Reptilia (Münster) 12 (66): 32-37 - get paper here
  • Bryson, R.W., Jr. & D. Lazcano 2004. A longevity record for the Mexican cross-banded mountain rattlesnake (Crotalus transversus) Bull. Maryland Herpetol. Soc., 40(4): 196-198. - get paper here
  • Camarillo, J.L.; Campbell, J.A. 1993. A 2nd Confirmed Population of the Rare Mexican Rattlesnake, Crotalus transversus (Serpentes, Viperidae). Texas Journal of Science 45 (2): 178-179 - get paper here
  • Campbell J A 1988. Crotalus transversus Taylor. Cross-banded mountain rattlesnake. Catalogue of American Amphibians and Reptiles ( 450: 1-3 - get paper here
  • Campbell, J.A. & Lamar, W.W. 1989. The Venomous Reptiles of Latin America. Comstock Publishing/Cornell University Press, Ithaca
  • Castro-Franco, Rubén, María Guasalupe Bustos-Zagal 1994. List of reptiles of Morelos, Mexico, and their distribution in relation to vegetation types. Southwestern Naturalist 39 (2): 171-175 - get paper here
  • Centenero-Alcalá, E., U. O. García-Vázquez, A. A. Mendoza-Hernández, J. G. Zamora-Abrego and V. H. Jiménez-Arcos. 2010. Crotalus transversus. Geographic distribution. [Second record for Distrito Federal (now named Ciudad de México), and first record for Tlalpan delegation.] Herpetological review 41 (4): 515-516 - get paper here
  • Davis, William B.; Smith, Hobart M. 1953. Snakes of the Mexican state of Morelos. Herpetologica 8: 133-149 - 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
  • Heimes, P. 2016. Snakes of Mexico. Chimaira, Frankfurt, 572 pp
  • Heimes, P. & Aguilar Cortés, R. 2004. Verbreitung und Typus-Fundort von Crotalus transversus TAYLOR 1944. Salamandra 40 (1): 91-96 - get paper here
  • 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
  • Lemos-Espinal JA, Smith GR 2020. A conservation checklist of the herpetofauna of Morelos, with comparisons with adjoining states. ZooKeys 941: 121-144 - get paper here
  • Lemos-Espinal JA, Smith GR 2020. A conservation checklist of the amphibians and reptiles of Mexico City, with comparisons with adjoining states. ZooKeys 951: 109-131 - get paper here
  • Lemos-Espinal JA, Smith GR 2020. A conservation checklist of the amphibians and reptiles of the State of Mexico, Mexico with comparisons with adjoining states. ZooKeys 953: 137-159 - 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
  • McDiarmid, R.W.; Campbell, J.A. & Touré,T.A. 1999. Snake species of the world. Vol. 1. [type catalogue] Herpetologists’ League, 511 pp.
  • 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
  • Strimple, Pete 1995. Crotalus transversus Taylor 1944, the cross-banded mountain rattlesnake. Litteratura Serpentium 15 (2): 31-39
  • Strimple, Peter D. 1995. Mexico's cross-banded mountain rattlesnake. Reptile & Amphibian Magazine 1995 (May/June): 46-51
  • Taylor, Edward H. 1944. Two new species of Crotalid snakes from Mexico. Univ. Kansas Sci. Bull. 30 (4): 47-56 - get paper here
  • 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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