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It has been thought that megalodon became extinct around the end of the Pliocene, about 2.6 Mya; [21] [22] claims of Pleistocene megalodon teeth, younger than 2.6 million years old, are considered unreliable. [22] A 2019 assessment moves the extinction date back to earlier in the Pliocene, 3.6 Mya. [23]
The occurrence of derived sharks in the Devonian is also irreconcilable with the results of all phylogenetic estimates in the group. [6] [7] [8] It is debated whether the extinct families Orthacodontidae and Paraorthacodontidae belong to the Hexanchiformes or the extinct Synechodontiformes. However, the Shark-References database currently lists ...
Otodontidae is an extinct family of sharks belonging to the order Lamniformes.Its members have been described as megatoothed sharks. [1] [2] They lived from the Early Cretaceous to the Pliocene, and included genera such as Otodus, including the giant megalodon. [3]
The fossils of Otodus sharks indicate that they were very large macro-predatory sharks. [7] The largest known teeth of O. obliquus measure about 104 millimetres (4.1 in) in height. [8] The vertebral centrum of this species are over 12.7 cm (5 inch) wide. [7] Scientists suggest that O. obliquus would have measured about 8–9 metres (26–30 ft ...
[10] [11] Sharks are often killed for shark fin soup, which some Asian countries regard as a status symbol. [12] Fishermen capture live sharks, fin them, and dump the finless animal back into the water to die from suffocation or predators. [11] [13] Sharks are also killed for their flesh in Europe and elsewhere. [14]
Galeocerdo is a genus of ground shark. Only a single species, G. cuvier , the tiger shark , is extant. [ 1 ] The earliest fossils date back to the early Eocene epoch, ( Ypresian ), around 56–47.8 Million years ago. [ 2 ]
The largest species of the genus known to have existed is C. kamchaticus from the Early Eocene of Kamchatka, Russia, whose teeth are about twice the size of modern frilled shark teeth. It is one of the largest frilled sharks known to have existed, with estimated body length of 3.80 metres (12.5 ft).
Ptychodus was a large shark, previously estimated at 10 meters (33 feet) long based on extrapolation from teeth. [ 13 ] [ 14 ] The subadult specimen with the largest vertebra showed that it could reach lengths of 4.3–7.07 m (14.1–23.2 ft), so a 10 m (33 ft) length is possible, but more analysis is required for verification.