Photo credit:

Dick Bartlett

Common name

Tamaulipan Rock Rattlesnake

Scientific name

Crotalus morulus

Conservation Status

Federal and State Protections

Countries of Occurrence


States or Providence 


Adult size

Species Description

The Tamaulipan rock rattlesnake was only recently elevated to its own species by Bryson et al. 2014. It occupies humid pine-oak forest in the Sierra Madre Oriental in Mexico between 4000 and 9000 ft elevation. Little is known about this rattlesnake's ecology, but its venom is being used in research for future medications.

Fun fact: In 2016, researchers from universities in the United States, Mexico, and Venezuela were the first to isolate a protein in the venom of the Tamaulipan rock rattlesnake called morulustatin which has implications for future antithrombotic and anticancer drugs.

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