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The list of extinct cetaceans features the extinct genera and species of the order Cetacea. The cetaceans (whales, dolphins and porpoises) are descendants of land-living mammals, the even-toed ungulates. The earliest cetaceans were still hoofed mammals.
The baiji (Lipotes vexillifer), is a probably extinct species of freshwater dolphin native to the Yangtze river system in China. It is thought to be the first dolphin species driven to extinction due to the impact of humans. This dolphin is listed as "critically endangered: possibly extinct" by the IUCN, has not been seen in 20 years, and ...
Baiji Dolphin (Lipotes vexillifer) ... Once numbering in the billions, the Passenger Pigeon was driven to near extinction in the 20th century due to overhunting and habitat destruction. Their ...
A common bottlenose dolphin (Tursiops truncatus). A dolphin is an aquatic mammal in the clade Odontoceti (toothed whale).Dolphins belong to the families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the New World river dolphins), Pontoporiidae (the brackish dolphins), and possibly extinct Lipotidae (baiji or Chinese river dolphin).
In fact, all extant river dolphin species are endangered or critically endangered, the IUCN says. Researchers discovered the Amazonian dolphin fossil in 2018, near the Napo River in Loreto, Peru.
Unlike some other dolphin species, the Atlantic humpback dolphin swims in relatively shallow waters, less than 30 meters in depth. This proclivity for shallow waters means that the dolphins should ...
The fossils of squalodontids indicate that this species is more closely related to endangered species of dolphins and not to most of the living dolphins today. [8] S. bariensis skull. The systematic placement of Squalodon within Odontoceti was long unclear. For a long time, it was thought to be close of the ancestry of modern dolphins and ...
More recently in 2007 the Baiji dolphin , a rare river dolphin native to China, was presumed extinct. The last documented sighting of the baiji dolphin occurred in 2002.