アメリカ自然史博物館のインスタグラム(amnh) - 5月23日 02時38分

This #FossilFriday is a Florida native!
Metaxytherium floridanum is a 12-million-year-old sea cow. The earliest known fossils of sea cows are found in 50-million-year-old marine sediments, yet even at that early stage, two groups of sea cows had already evolved—the dugongs and the manatees. Metaxytherium is an extinct dugong. Unlike manatees, dugongs lack nails on their flippers, and have a deeply notched tail fin with two pointed lobes. This fossil was collected in 1929 in Gadsden County, Florida. Another immense dugong species, the Stellar sea cow, survived until around the year 1800 in the waters of the North Pacific. Reaching a length of almost 25 feet (7.5 meters) and weighing about 9,000 lbs (4,000 kg), it was hunted to extinction by humans.
See this fossil in the Museum’s Hall of Advanced Mammals.
AMNH/C.Chesek

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