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Otodus megalodon (/ ˈ m ɛ ɡ əl ə d ɒ n / MEG-əl-ə-don; meaning "big tooth"), commonly known as megalodon, is an extinct species of giant mackerel shark that lived approximately 23 to 3.6 million years ago (Mya), from the Early Miocene to the Early Pliocene epochs.
The proportion of extinct large mammal species (more than or equal to 10 kg (22 lb)) in each country during the last 132,000 years, only counting extinctions earlier than 1000 years BP
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Dimetrodon (/ d aɪ ˈ m iː t r ə ˌ d ɒ n / ⓘ [1] or / d aɪ ˈ m ɛ t r ə ˌ d ɒ n /; [2] lit. ' two measures of teeth ') is an extinct genus of sphenacodontid synapsid tetrapods that lived during the Cisuralian age of the Early Permian period, around 295–272 million years ago.
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The number of trees threatened with extinction is more than double the number of all birds, mammals, reptiles and amphibians threatened combined, according to the assessment.
A megalodon tooth with two great white shark teeth. Megalodon is the state fossil of North Carolina. During the ensuing Pliocene epoch, North Carolina was home to invertebrate faunas including at least 25 species of gastropods and 46 pelecypods. [22] Pliocene fossil scallops are known from the Yorktown Formation of Northampton and Hertford ...
Arctodus simus went extinct around 12,800 years ago, and is one of the most recently dated megafauna to go extinct in North America, being reliably dated to within the Pleistocene-Holocene boundary (13,800 BP - 11,400 BP). [242] [134] [243] Both local and regionalized dietary flexibility has been a factor suggested for the species' longevity.