Photo by Myke Clarkson
San Lucan Rattlesnake
Crotalus ruber lucansensis
Federal and State Protections
Countries of Occurrence
States or Providence
Baja California Sur
Loreto, La Paz, Comondú, Los Cabos
90cm (35.4in) - 122cm (48in)
This subspecies shows a slight tendency for rattle loss with less than half of individuals retaining a rattle after a shed! San Lucan Island Rattlesnakes feature a blunted proximal (base) rattle segment which has less distinct lobes and grooves, thus increasing the chances of the new rattle segment failing to remain in place.
This large rattlesnake can be found in the cape region of lower Baja California and some surrounding islands. It can grow to nearly 4 ft long! It occurs in habitat including heavy brush and rocks. The San Lucan diamond rattlesnake is primarily nocturnal.
It is hypothesized this subspecies diverged from C. ruber ruber due to a large divide of unsuitable habitat sometime during the Pleistocene. In the present day, both subspecies have extended their range and now overlap in the area around Loreto.