Nearctical, Neotropical: C. triseriatus
is native to Mexico. It is found in temperate climates of the Trans
Mexican Volcanic Belt from wc. Veracruz through Puebla, Tlaxcala,
México, D.F., Morelos and Michoacán. Isolated population
in Jalisco and possibly Nayarit.
Crotalus triseriatus triseriatus
- From w. Michoacán to wc. Veracruz.
Crotalus triseriatus armstrongi
- highlands of w. Jalisco and possibly nearby Nayarit and Colima.
Physical characteristics: A medium
sized venomous snake (50 to 60 cm). Males are bigger than females.
Body color can range from olive brown to dark brown and even greenish,
but the conspicuous pattern of oval and semioval spots along the
back is always present. These dark spots are surrounded by thin
lighter line. In the posteroventral region on the head a clearly
defined wide, dark (black) line bordered by thin white lines is
Dorsal scales ale keeled. Scales of lateral regions are smooth and
bigger. Ventral region is pearl gray.
Food habits: Principal food items
are lizards, frogs and rodents.
Reproduction: As all the species
of the same genus, C. triseriatus
is viviparous. Reproductive activity was observed in the fall. Around
10 individuals per clutch were recorded in summer months.
Behavior: A highly diurnal species,
with only the occasional juvenile being found active after dark.
Habitat: Inhabits principally
coniferous (especially pine -oak) forests of temperate zones, in
altitudes over 2000 m. Prefers zacaton (bunch grass) microhabitats
with presence of fallen tree trunks and rocks. It was also observed
in corn plantations.
Biomes: temperate forest