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''Sivapithecus'' (Shiva's Ape) is a genus of extinct primates. Fossil remains of animals now assigned to this genus, dated from 12.2million years old〔Page 52, ISBN 978-0-19-568785-9, Book- India's Ancient Past by R.S.Sharma〕 in the Miocene, have been found since the 19th century in the Siwalik Hills in the Indian Subcontinent. Any one of the species in this genus may have been the ancestor to the modern orangutans. Some early discoveries were given the separate names Ramapithecus (Rama's Ape) and Bramapithecus (Brahma's Ape), and were thought to be possible ancestors of humans. This view is no longer considered tenable. ==Discovery== The first incomplete specimens of ''Sivapithecus'' were found in northern India in the late 19th century. Another find was made in Nepal on the bank of Tinau River, Butwal; a western part of the country in 1932. This find was named "Ramapithecus". The finder (G. Edward Lewis) claimed that it was distinct from Sivapithecus, as the jaw was more like a human's than any other fossil ape then known. In the 1960s this claim was revived. At that time, it was believed that the ancestors of humans had diverged from other apes 14 million years ago. Biochemical studies upset this view, suggesting that there was an early split between orangutan ancestors and the common ancestors of chimpanzees, gorillas and humans. Meanwhile, more complete specimens of ''Ramapithecus'' were found in 1975 and 1976, which showed that it was less human-like than had been thought. It began to look more and more like ''Sivapithecus'' - meaning that the older name must take priority. It could be that ''Ramapithecus'' was just the female form of ''Sivapithecus''. They were definitely members of the same genus. It is also likely that they were already separate from the common ancestor of chimps, gorillas and humans, which may be represented by the prehistoric great ape ''Nakalipithecus nakayamai''. Siwalik specimens once assigned to the genus ''Ramapithecus'' are now considered by most researchers to belong to one or more species of ''Sivapithecus''. ''Ramapithecus'' is no longer regarded as a likely ancestor of humans. In 1982, David Pilbeam published a description of a significant fossil find — a large part of the face and jaw of a ''Sivapithecus''. The specimen bore many similarities to the orangutan skull and strengthened the theory (previously suggested by others) that ''Sivapithecus'' was closely related to orangutans. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sivapithecus」の詳細全文を読む スポンサード リンク
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