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He then reasoned that humans diverged from the Catarhine stock comprising of humans, anthropoid apes, and Old World monkeys, all having nostrils opening downward and close together and a nonprehensile, often greatly reduced or vestigial tail. Simian T-cell lymphotropic viruses, enzootic in both Asian and African Old World monkeys and apes, may have repeatedly crossed the species barrier (7,8). An ancestor of the howler monkeys had apparently matched the gene duplication that Old World monkeys experienced, yet the evolutionary force preserving the new opsin doesn't appear to have been an advantage in gathering fruit. |
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