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Bos acutifrons is the most ancient representative of the genus Bos. Fossils of Bos acutifrons are found in middle Pleistocene-aged strata of India. It is widely accepted that from this species all later species arose. Between 1.5 and 2 million years ago the aurochs probably descended from this species.
References
Bos acutifrons Wikipedia(Text) CC BY-SA