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The evolution of cetaceans is thought to have begun in the Indian subcontinent from even-toed ungulates (Artiodactyla) 50 million years ago (mya) and to have proceeded over a period of at least 15 million years. [2] Cetaceans are fully aquatic mammals belonging to the order Artiodactyla and branched off from other artiodactyls around 50 mya.
Pakicetus (meaning "whale from Pakistan") is an extinct genus of amphibious cetacean of the family Pakicetidae, which was endemic to Indian Subcontinent during the Ypresian (early Eocene) period, about 50 million years ago. [2] It was a wolf-like mammal, [3] about 1–2 m (3 ft 3 in – 6 ft 7 in) long, [4] and lived in and around water where ...
They are related to the Indohyus, an extinct chevrotain-like ungulate, from which they split approximately 48 million years ago. [20] [21] The primitive cetaceans, or archaeocetes, first took to the sea approximately 49 million years ago and became fully aquatic by 5–10 million years later. [22] Archaeoceti is a parvorder comprising ancient ...
Dolphins entered the water roughly fifty million years ago. Dolphins' ancestors maybe? Changed. BabyNuke 14:33, 15 March 2007 (UTC) Unlike most mammals, dolphins do not have hair, but they are born with a few hairs around the tip of their rostrum which they lose after some time adult dophins do not have hair perhaps? It is clear as it is.
Ambulocetus (Latin ambulare "to walk" + cetus "whale") is a genus of early amphibious cetacean [a] from the Kuldana Formation in Pakistan, roughly 48 or 47 million years ago during the Early Eocene . It contains one species , Ambulocetus natans (Latin natans "swimming"), known solely from a near-complete skeleton.
End Ordovician: 440 million years ago, 86% of all species lost, including graptolites; Late Devonian: 375 million years ago, 75% of species lost, including most trilobites; End Permian, The Great Dying: 251 million years ago, 96% of species lost, including tabulate corals, and most trees and synapsids
Mike McDaniel was born a decade — 10 years, one month and 20 days, to be exact — after the 1972 Dolphins hoisted the Lombardi Trophy and became the first team in NFL history to achieve a ...
Since the late Eocene, about 40 million years ago, cetaceans populated the subtropical oceans and no longer emerged on land. An example is the 18 metre long Basilosaurus, sometimes called Zeuglodon. The transition from land to water was completed in about 10 million years.