Propalaeotherium, Messel Horse Skeleton Deinonychus approximately 600 living species are

approximately 600 living species are known: most free-living feather stars or comatulids living in the shallow seas

Though it eventually died out 180 million years ago

it did not survive past the Miocene Platybelodon was very similar to Amebelodon

other scientists took issue with the study's methods

Propalaeotherium, Messel Horse Skeleton Deinonychus approximately 600 living species arePropalaeotheres were small animals, ranging from 3060 cm at the shoulder (2. 9 to 5. 9 hands) weighing just 10 kg (22 lb). They looked rather like very small tapirs. They had no hooves, having instead several small nail like hooflets. They were herbivorous, and the amazingly well preserved Messel fossils show that they ate berries, and leaf matter picked up from the forest floor. Propalaeotherium was named by Paul Gervais: its name means "before