This page contains lists of reptiles found in the Sierra de Manantlán Biosphere Reserve, which straddles the states of Colima and Jalisco in Mexico.
The reserve is located in the transition of the Nearctic and Neotropical realms and encompasses parts of the Sierra Madre del Sur, with a wide range of altitudes, climates and soils.
As of 1995 almost 8,000 people lived in the Reserva de la Biosfera Manantlan, engaged mainly in agriculture (corn, beans, tomatoes, sugar cane, watermelon, mangoes), livestock grazing, timber production, and extraction of wood for fuel and mining of coal or minerals.
The Reserva de la Biosfera Manantlan's varied and complex plant cover harbours a great wealth of flora.
In terms of herpetofauna, 85 species have been recorded; of these it is known that 13 are endemic to the western and central region of Mexico: the rattlesnake, the black iguana, the frog Shyrrhopus modestus, the beaded lizard Heloderma horridum and the Autlan rattlesnake (Crotalus lannomi), an endemic species only reported for the area of Puerto de Los Mazos.