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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.
It exceeded 3 m (9.8 ft) in length, and would have weighed in at around 200 kg (440 lb), much larger than any other known mustelid, living or extinct. [157] [158] [159] There were other giant otters, like Siamogale, at around 50 kg (110 lb) [160] and Megalenhydris, which was larger than a modern-day giant river otter. [161]
[13] [14] The ancestors of cetaceans are believed to have been the semiaquatic pakicetids, no larger than dogs, of about 53 million years (Ma) ago. [15] By 40 Ma ago, cetaceans had attained a length of 20 m (66 ft) or more in Basilosaurus , an elongated, serpentine whale that differed from modern whales in many respects and was not ancestral to ...
They grew around 50 feet long, which is bigger than a city bus. What caused the demise of such a commanding creature is an ongoing investigation, but scientists hav There's a fascinating new clue ...
Scientists don't know for sure whether the megalodon ever lived in Mississippi even if some of its teeth were found in the Magnolia State. National Megalodon Day is June 15. Here are 5 things to ...
Like other known megatooth sharks, the fossils of O. angustidens indicate that it was considerably larger than the extant great white shark, with the largest individuals possibly measuring up to 11–12 metres (36–39 ft) long. [7] [8] A well preserved specimen from New Zealand is estimated at 9.3 m (31 ft) in length. [5]
A new study finds that megatooth sharks’ warm-blood adaptation and giant size may have played a role in their extinction.
Brachysuchus (meaning "wide crocodile") is an extinct genus of phytosaur known from the late Triassic period (Carnian stage) of Dockum Group in Texas, United States.It is known from the holotype UMMP 10336 [1] is composed of a skull, lower jaws and partial postcranium and from the associated paratype UMMP 14366, nearly complete skull, recovered from the 'Pre-Tecovas Horizon' in the Dockum Group.