It has the largest distribution of all neotropical boas. Distribution and habitat īoa constrictor occidentalis is an exclusively New World subspecies and is found in Argentina, between the Andes Mountains and the Parana River, Paraguay, and reportedly in Bolivia. Scalation īoa constrictor occidentalis possesses 242-251 ventral scales, 64-87 dorsal scales, 21-22 supralabial scales, and 45 subcaudal scales. Young members of this species commonly exhibit a pink hue that darkens as they reach sexual maturity. This species usually possesses a grey belly and a dark line running from the neck to the tip of its snout, as well as from the eyes to the neck. Male Argentine boas generally have longer tails in order to contain the hemipenes as well as having longer pelvic spurs that the male uses to grip onto the female and stimulate during copulation.īoa constrictor occidentalis possess a wide range of scale coloration ranging from black specimens with a high rate of contrasting white to specimens exhibiting varying degrees of burnt-orange to red. Female members are much heavier, weighing at an average of 6.13 kg (13.5 lb). Male members of this subspecies on average weigh 4.06 kg (8.95 lb). Whereas adult females can reach lengths of 8 to 10 feet regularly, though some members have been found to reach as long as 4 m (13.13 ft). Adult males reach anywhere between 6 and 8 feet. The Boa constrictor occidentalis subspecies experiences sexual dimorphism, with females being greater in size and weight.
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