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.

Lepidus - This is a small species that rarely exceeding 32" in length.

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.

Viridis - This species commonly grows to more than 100 cm in length.

Order : Squamata
Family : Viperidae
Genus : Crotalus