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Common names: ridge-nosed rattlesnake, Willard's rattlesnake, Willard's rattler [4] Crotalus willardi is a venomous pit viper species found in the southwestern United States and Mexico. This snake is found mainly in the "sky island" region. [5] The IUCN reports this snake's conservation status as being of Least Concern. [1]
A Guide to the Rattlesnakes and other Venomous Serpents of the United States. Tempe, Arizona: Tricolor Books. 129 pp. ISBN 978-0-9754641-3-7. (Crotalus pricei pricei, pp. 62–63). Schmidt KP, Davis DD (1941). Field Book of Snakes of the United States and Canada. New York: G.P. Putnam's Sons. 365 pp. (Crotalus triseriatus pricei, p. 306).
Common names: Middle American rattlesnake, [2] Central American rattlesnake, [4] tzabcan (local name for subspecies C. s. tzabcan) Crotalus simus is a venomous pit viper species found in Mexico and Central America. The specific epithet is Latin for "flat-nosed", likely because its head is blunt compared with lanceheads .
Crotalus helleri or Crotalus oreganus helleri, also known commonly as the Southern Pacific rattlesnake, [3] the black diamond rattlesnake, [4] and by several other common names, is a pit viper species [5] or subspecies [3] found in southwestern California and south into Baja California, Mexico, that is known for its regional variety of dangerous venom types.
Totonacan rattlesnake Northeastern Mexico from central Nuevo León through southern Tamaulipas, northern Veracruz, eastern San Luis Potosí, and northern Querétaro. [3] C. transversus: Taylor, 1944 0 Cross-banded mountain rattlesnake Central Mexico in the State of Mexico and Morelos. C. triseriatus (Wagler, 1830) 1 Mexican dusky rattlesnake
[27] [28] However, because of its large venom glands and specialized fangs, the western diamondback rattlesnake can deliver a large amount of venom in a single bite. The average venom yield per bite is usually between 250 and 350 mg, with a maximum of 700–800 mg. [ 5 ] [ 29 ] Severe envenomation is rare but possible, and can be lethal.
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Common names: red diamond rattlesnake, red rattlesnake, red diamond snake, [3] more. Crotalus ruber is a venomous pit viper species found in southwestern California in the United States and Baja California in Mexico. Three subspecies are currently recognized, including the nominate subspecies described here. [4]