Crotalus estebanensis KLAUBER, 1949

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Higher Taxa	Viperidae, Crotalinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies
Common Names	E: San Esteban Island Rattlesnake G: San Esteban-Klapperschlange S: Cascabel de San Esteban
Synonym	Crotalus molossus estebanensis KLAUBER 1949 Crotalus molossus estebanensis — CLIFF 1954 Crotalus molossus estebanensis — LINER 1994 Crotalus estebanensis — GRISMER 1999 Crotalus molossus estebanensis — BEAMAN & HAYES 2008 Caudisona (Smythus) estebanensis — HOSER 2009 Crotalus estebanensis — WALLACH et al. 2014: 190 Crotalus estebanensis — DIAZ DE LA VEGA-PÉREZ 2016 Crotalus estebanensis — HEIMES 2016 Crotalus estebanensis — JOHNSON et al. 2017 Crotalus estebanensis — GARCÍA-PADILLA et al. 2025
Distribution	Mexico (Sonora: Isla San Esteban) Type locality: "San Esteban Island, Gulf of California, Mexico".
Reproduction	ovoviviparous.
Types	Holotype: SDNHM = SDSNH 26792.
Diagnosis	Additional details, e.g. a detailed description or comparisons (1662 characters), are available for collaborators and contributors. Please contact us for details.
Comment	Venomous! GRISMER (1999) elevated estebanensis to full species status based on morphology and coloration using an evolutionary species concept.
Etymology	Named after the type locality.
References	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 Cliff, Frank S. 1954. Snakes of the islands in the Gulf of California, Mexico. Transactions of the San Diego Society of Natural History 12 (5): 67-98 - get paper here Díaz de la Vega-Pérez, Aníbal H., Víctor H. Jimenez-Arcos, Rafael A. Lara-Resendiz, Fausto R. Méndez-de la Cruz and Ali Rabatsky. 2016. Crotalus estebanensis. Activity and thermoregulation. Mesoamerican Herpetology 3 (3): 739–741 - get paper here Enderson, Erik F.; Adrian Quijada-Mascareñas; Dale S. Turner; Philip C. Rosen & Robert L. Bezy 2009. The herpetofauna of Sonora, Mexico, with comparisons to adjoining states. Check List 5 (3): 632–672 - 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 GARCÍA-PADILLA, ELI; JORGE H. VALDEZ VILLAVICENCIO, ANNY PERALTA GARCÍA 2018. Las Serpientes de Cascabel más allá del continente. Especies - get paper here Grismer, L. Lee. 1999. An evolutionary classification of reptiles on islands in the Gulf of California, México. Herpetologica 55 (4): 446-469 - 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 Johnson, J. D., L. D. Wilson, V. Mata-Silva, E. García-Padilla, and D. L. DeSantis. 2017. The endemic herpetofauna of Mexico: organisms of global significance in severe peril. Mesoamerican Herpetology 4 (3): 544–620 - get paper here Klauber, Laurence M. 1949. Some new and revived subspecies of rattlesnakes. Transactions of the San Diego Society of Natural History 11 (6): 61-116 - get paper here Lemos-Espinal JA, Smith GR, Rorabaugh JC 2019. A conservation checklist of the amphibians and reptiles of Sonora, Mexico, with updated species lists. ZooKeys 829: 131-160 - get paper here Liner, E.A. 1994. Scientific and common names for the Amphibians and Reptiles of Mexico in English and Spanish. Herpetological Circular 23: 1-113 Reyes-Velasco J., Cox C. L., Jones J. M., Borja M,, y 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 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.
External links	IUCN Red List Google images

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