mother with her baby (
Andaman Islands,
India, 1905) Based on perceived physical similarities, Negritos were once considered a single population of closely related people. However, genetic studies suggest that they consist of several separate groups descended from the same ancient
East Eurasian meta-population that gave rise to modern
East Asian peoples and
Oceanian peoples, as well as displaying genetic heterogeneity. The Negritos form the indigenous population of Southeast Asia, but were largely absorbed by
Austroasiatic- and
Austronesian-speaking groups who migrated from southern East Asia into Mainland and Insular Southeast Asia with the
Neolithic expansion. The remainders form minority groups in geographically isolated regions. Genetic studies provided mixed evidence of modern Negrito populations, with populations considered Negrito showing diverse admixtures. Although a genetic affinity between Andaman Islanders, Malaysian and Filipino Negritos was detected by some authors, several studies indicate that Negrito populations are closer to their neighboring non-Negrito communities in their paternal heritage and autosomal DNA on average. Most modern groups considered Negrito possess significant admixture from Austronesian or Austroasiatic sources, with Negrito groups in the Philippines found to have between 30 and 50% Austronesian ancestry. The
Semang and
Maniq in the interior of the Malay Peninsula share genetic affinities with ancient
Hoabinhian hunter-gatherers, while also possessing ~35% East Asian related ancestry, likely brought about by recent admixture with surrounding agriculturalist communities in the region, according to the authors of a 2022 genetic study. It has been found that the physical and morphological phenotypes of Negritos, such as short stature, a broad and snub nose,
kinky hair and dark skin, "
are shaped by novel mechanisms for adaptation to tropical rainforests" through
convergent evolution and
positive selection, rather than a remnant of a shared common ancestor, as suggested previously by some researchers. A Negrito-like population was most likely also present in
Taiwan before the Neolithic expansion and must have persisted into historical times, as suggested by evidence from morphological features of human skeletal remains dating from around 6,000 years ago resembling Negritos (especially Aetas in northern Luzon), and further corroborated by Chinese reports from the
Qing period rule of Taiwan (1684 to 1895) and from tales of
Taiwanese indigenous peoples about people with "dark skin, short-and-small body stature, frizzy hair, and occupation in forested mountains or remote caves". ==See also==