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You mean hominin. And Hurzeler and others have suggested that Oreopithecus was a hominin. Cranio-dentally, Oreopithecus is extremely similar to Sahelanthropus. And it had a foot that was similar to that of Ardipithecus. The last semiaquatic phase ended approximately 2.6 million years ago, IMO. They are the result of island isolation. I should also note that humans have kidneys like marine mammals. Humans are the only Catarrhine primate that has kidneys with medullary pyramids, a feature that is nearly universal in the kidneys of marine mammals. Marcel F. Williams