Chelonoidis chilensis (Gray, 1870)

Carapace Size

When measured along a straight line, the carapace of Chelonoidis chilensis can reach a maximum length of 43.3 cm, though most individuals grow to less than 25 cm.

Carapace Coloration

The carapace may be entirely yellowish brown, or each of its scutes can feature dark-brown to black rings that surround a tan center.

Population Size Variation

Individuals from more southern populations tend to be much larger than members of more northern populations.

Shell Edge and Scute Markings

The edge of the shell is slightly serrated, and each scute has a dark wedge of pigment at its back edge.

Plastron Coloration

The plastron may be uniformly yellowish-brown, or it may have a dark triangular wedge along the seam of each scute.

Soft Part Coloration

The head, limbs, and tail are colored greyish to yellowish-brown.

Limb and Thigh Scale Morphology

The front of each forelimb is covered in large, angular scales, and each thigh has several enlarged tubercles.

Common Name and Geographic Range

This species, commonly called the Chaco tortoise, occurs mainly in Argentina, and also lives in Bolivia and Paraguay.

Habitat Ecoregions

It is found mostly within the Chaco and Monte ecoregions.

Distribution Limiting Factors

Its distribution is primarily limited by temperature-related variables, and by precipitation during the reproductive period.