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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.
Megalodon sharks were “the size and weight of a railroad car” and reigned over the world’s oceans “roughly 23 to 3.6 million years ago,” according to the National Museum of Natural History.
On April 25, 1977, the Japanese trawler Zuiyō Maru, fishing east of Christchurch, New Zealand, caught a strange, unknown creature in the trawl.The crew was convinced it was an unidentified animal, [4] but despite the potential biological significance of the curious discovery, the captain, Akira Tanaka, decided to dump the carcass into the ocean again so not to risk spoiling the fish caught.
Stethacanthidae is an extinct family of prehistoric sharks. [1] It is estimated to have existed approximately between 380 and 300 million years ago. Members of this family are noted for their peculiar dorsal fin.
The behemoth clocked in at a whopping 6 1/6 inches in length—roughly the size of a human hand!
The otodontid sharks have been considered to have been ectotherms, so on that basis megalodon would have been ectothermic. However, the largest contemporary ectothermic sharks, such as the whale shark, are filter feeders, while lamnids are regional endotherms, implying some metabolic correlations with a predatory lifestyle.
Virginia-native Foster Frazier, 7, was digging along the side of a stream at the tourist hotspot when he uncovered the nearly 5-inch tooth, which reportedly belonged to a prehistoric megalodon.
Cretalamna is a genus of extinct otodontid shark that lived from the latest Early Cretaceous to Eocene epoch (about 103 to 46 million years ago). It is considered by many to be the ancestor of the largest sharks to have ever lived, such as Otodus angustidens , Otodus chubutensis , and Otodus megalodon .