Let me rephrase myself, no known hominid has become specialized for aquatic feeding behaviour for an extensive period of evolutionary time that has relevance for the Aquatic Ape Hypothesis as it applies to modern humans. As far as we know, all of our ancestors over the past 6-8 million years lived in woodlands, savannas, and maybe rainforests.
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