Alouatta seniculus puruensis Lönnberg, 1941

3.3.4.4 Alouatta seniculus puruensis Lönnberg, 1941 View in CoL

This subspecies is distributed along both margins of the Rio Purus, to the lower Rio Madeira and the middle Rio Aripuanã, extending eastward to the Rio Teles Pires. To the south, it is restricted to the northern margin of the Rio Abunã on the border of Bolivia ( Glander and Pinto 2013) ( Fig. 3.1 View Fig ). Gregorin (2006) reported the southernmost locality for this species to be Placido de Castro in Acre, Brazil.

The main diagnostic character for this subspecies is the sexual dichromatism, with males being dark rufous (back mahogany red and flanks and limbs maroon [ Hill 1962]) and females golden orange with the distal portions of the limbs, tails, and beard dark rufous (pale yellowish, with the flank fringe partially orange and the limbs and tail also showing some orange [ Hill 1962]). Gregorin (2006) found morphological differences in the shape of the hyoid bone, and proposed that it be considered a full species. We continue to place this taxon as a subspecies of A. seniculus until genetic studies reveal the degree of divergence (if any) with the other members of this species.