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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]
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. Cetaceans are fully aquatic mammals belonging to the order Artiodactyla and branched off from other artiodactyls around 50 mya.
Cetacea is an infraorder that comprises the 94 species of whales, dolphins, and porpoises.It is divided into toothed whales (Odontoceti) and baleen whales (Mysticeti), which diverged from each other in the Eocene some 50 million years ago (mya).
80 million to 50 million years ago, Laramidia. Above ground, things live and die and disappear. But the dinosaur, encased in layers of sediment, is exempt from this endless cycle of growth and decay.
Birds appeared about 150 million years ago and bats around 50 million years ago. The pterosaurs were wiped out in the same mass extinction event that doomed the dinosaurs, aside from their bird ...
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
Pterosaurs, cousins of the dinosaurs, were the first of three vertebrate groups to achieve powered flight, followed by birds about 150 million years ago and bats around 50 million years ago ...