Crotalus lorenzoensis RADCLIFF & MASLIN, 1975

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Higher Taxa	Viperidae, Crotalinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies
Common Names	E: Red Diamond Rattlesnake (exsul: Cedros Island Rattlesnake; lorenzoensis: San Lorenzo Island Rattlesnake; lucasensis: San Lucan Rattlesnake; ruber: Red Diamond Rattlesnake; monserratensis: Red Rattlesnake) G: Rote Diamant-Klapperschlange S: Cascabel de San Lorenzo
Synonym	Crotalus ruber lorenzoensis RADCLIFF & MASLIN 1975 Crotalus ruber lorenzoensis — LINER 1994 Crotalus lorenzoensis — GRISMER 1999 Crotalus ruber lorenzoensis — BEAMAN & HAYES 2008 Hoserea (Mullinsus) lorenzoensis — HOSER 2009 Crotalus lorenzoensis — HEIMES 2016 Crotalus lorenzoensis — JOHNSON et al. 2017 Crotalus lorenzoensis — GARCÍA-PADILLA et al. 2025
Distribution	Mexico (Baja California: endemic to Isla San Lorenzo, Isla Cedros. Type locality: Isla San Lorenzo
Reproduction	ovoviviparous. Crotalus ruber has been hybridized with C. atrox (SCHMIDT 2004).
Types	Holotype: SDNHM = SDSNH 46009; paratypes SDNHM = SDSNH 6605, 45052, 45053
Diagnosis	Additional details, e.g. a detailed description or comparisons (3124 characters), are available for collaborators and contributors. Please contact us for details.
Comment	Venomous! Subspecies: GRISMER (1999) suggested to elevate Crotalus ruber lorenzoensis to full species status based on 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 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 Liner, E.A. 1994. Scientific and common names for the Amphibians and Reptiles of Mexico in English and Spanish. Herpetological Circular 23: 1-113 Peralta-García A, Valdez-Villavicencio JH, Fucsko LA, Hollingsworth BD, Johnson JD, Mata-Silva V, Rocha A, DeSantis DL, Porras LW, and Wilson LD. 2023. The herpetofauna of the Baja California Peninsula and its adjacent islands, Mexico: composition, distribution, and conservation status. Amphibian & Reptile Conservation 17(1&2): 57–142 Radcliffe, C. W.; Maslin, T. Paul 1975. A new subspecies of the red rattlesnake, Crotalus ruber, from San Lorenzo Sur Island, Baja California Norte, Mexico. Copeia 1975 (3): 490-493 - get paper here 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
External links	IUCN Red List Google images

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