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Halitherium was an early sea cow that started in the late Eocene, then the Oligocene. Its fossils are common in European shales. Inside its flippers were finger bones that did not stick out. Halitherium also had very poorly developed back legs. Therefore, it had no external hind legs. It did, however, have a basic femur, joined to a reduced pelvis. Halitherium also had elongated ribs to increase lung capacity to provide fine control of buoyancy.
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