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Genus Crotalus
Eastern diamondback rattlesnake - The largest rattlesnake species, the maximum sizes reported are 244 cm and 251.
Queretaran Dusky Rattlesnake - This species grows to a maximum reported total length of 67.
Basilisk Rattlesnake - This is one of the largest rattlesnake species.
Santa Catalina Island Rattlesnake - This species is relatively slender and stunted, growing to a maximum of 73.
Lower California Rattlesnake - The maximum reported length of this species is 89.
Timber rattlesnake - Adults usually grow to an average length of 91-152 cm .
Mexican Smallhead Rattlesnake - This species grows to a maximum length of 50-60 cm.
Autlan Rattlesnake - Known only from a single specimen: a female 63.
Western rattlesnake - The size of this species varies greatly, with some populations being stunted and others growing very large.
Mexican Lancehead Rattlesnake - Adults usually grow to 60-70 cm, although exceptionally large specimens may be as much as 100 cm in length.
Twin Spotted Rattlesnake - Adults usually do not exceed 50-60 cm in length.
Tancitaran Dusky Rattlesnake - Adult males may grow to more than 50 cm in length.
Red Rattlesnake - This is a moderately large species that commonly exceeds 100 cm on the mainland.
Scutulatus - This species grows to an average of less than 100 cm in length, with a maximum of 137.
Longtail Rattlesnake - Adults do not usually grow to more than 60 cm in length.
Tiger rattlesnake - A relatively small species with adult reaching less than 100 cm in length.
Tortuga Island Rattlesnake - This species is smaller than its close relative, C.
Cross-banded Mountain Rattlesnake - Adults grow to a maximum recorded length of 46.
Queretaran Dusky Rattlesnake - Adult male specimens commonly grow to lengths greater than 60 cm, with females somewhat smaller.
Aruba Island rattlesnake - Moderately sized, this species attains an adult length of approximately 90 cm.
