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Miodelphinus is an extinct genus of platanistoid dolphin that lived during the Miocene epoch, about 18.7–18.5 million years ago. Its fossil, which was found in 1991 at Haze Formation (Japan) and described as a new genus in 2024, consists of a portion of its skull, hyoid bones, and ribs. The preserved part of the skull is 30 cm long with 4 cm ...
Analysis of the newly identified ancient dolphin’s skull told paleontologists that its body would have measured at least 11 feet (3.5 meters) long — making it about 20% to 25% bigger than ...
Researchers at the University of Zurich estimated that the 16-million-year-old fossil was more than 11 feet long and is said to be the longest freshwater dolphin ever found.
Fossils may be found either associated with a geological formation or at a single geographic site. Geological formations consist of rock that was deposited during a specific period of time. They usually extend for large areas, and sometimes there are different important sites in which the same formation is exposed.
Thanks to data collected by these apex predators, researchers revealed the world’s largest known seagrass ecosystem, which covers an area of about 35,000 square miles (92,000 square kilometers ...
This list currently includes only fossil genera and species. However, the Atlantic population of gray whales (Eschrichtius robustus) became extinct in the 18th century, and the baiji (or Chinese river dolphin, Lipotes vexillifer) was declared "functionally extinct" after an expedition in late 2006 failed to find any in the Yangtze River.
Fossil evidence indicates that megalodon preyed upon many cetacean species, such as dolphins, small whales, cetotheres, squalodontids (shark toothed dolphins), sperm whales, bowhead whales, and rorquals. [52] [72] [73] In addition to this, they also targeted seals, sirenians, and sea turtles. [74]
Australodelphis mirus is an extinct Pliocene dolphin. [2] A. mirus is known from fossils found in the Sørsdal Formation, Mule Peninsula, Vestfold Hills, East Antarctica. [1] The genus has been described as an example of convergent evolution with beaked whales. [1]