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Nature 413, 625-627 (11 October 2001) | doi:10.1038/35098072;

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The earliest known fully quadrupedal sirenian

Modern seacows (manatees and dugongs; Mammalia, Sirenia) are completely aquatic, with flipperlike forelimbs and no hindlimbs. Here I describe Eocene fossils from Jamaica that represent nearly the entire skeleton of a new genus and species of sirenian—the most primitive for which extensive postcranial remains are known.

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