Hyperbrachyskelic:
Hyperbrachyskelic individuals have a very short torso compared to the length of the legs. Their sitting height is below 49 percent of their overall height. Hyperbrachyskelia is only found in dry hot regions, where a larger body surface makes sweating more efficient. It is an example of Allen's rule. Hyperbrachyskelia is common in Australian natives, especially those of the northern regions of the continent. It is also present in the related New Caledonians, the Kanak, as well as Vedda. However, the strongest hyperbrachyskelia is found on the continent that also possesses the strongest hypermacroskelia: Africa. Some Nilotic tribes of the Upper Nile may show a cormic index as low as 45.7. Apart from Nilotes, the trait sporadically appears in Sudanids and Ethiopids.