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The most robust teeth in Livyatan were the fourth, fifth and sixth teeth in each side of the jaw. The well-preserved teeth all had a height greater than 31 cm (1 ft), and the largest teeth of the holotype were the second and third on the left lower jaw, which were calculated to be around 36.2 cm (1.2 ft) high.
Macroraptorial sperm whales were highly predatory whales of the sperm whale superfamily (Physeteroidea) of the Miocene epoch that hunted large marine mammals, including other whales, using their large teeth. They consist of five genera: Acrophyseter, Albicetus, Brygmophyseter, Livyatan and Zygophyseter. [1] All species are known by at least a ...
Zygophyseter had 28 teeth in the lower jaws and 26 in the upper jaws. [5] The curvature of the teeth increased medially, that is, the teeth in the front of the mouth were straighter than the teeth in the back of the mouth. The back teeth featured more wear than the front teeth.
Scaldicetus is an extinct genus of highly predatory macroraptorial sperm whale. Although widely used for a number of extinct physeterids with primitive dental morphology consisting of enameled teeth, Scaldicetus as generally recognized appears to be a wastebasket taxon filled with more-or-less unrelated primitive sperm whales.
The anterior teeth were almost perpendicular to the jaw and symmetrical, whereas the posterior teeth were slanted and asymmetrical. [63] Megalodon teeth can measure over 180 millimeters (7.1 in) in slant height (diagonal length) and are the largest of any known shark species, [29]: 33 implying it was the largest of all macropredatory sharks. [35]
The sperm whale or cachalot[ a ] (Physeter macrocephalus) is the largest of the toothed whales and the largest toothed predator. It is the only living member of the genus Physeter and one of three extant species in the sperm whale family, along with the pygmy sperm whale and dwarf sperm whale of the genus Kogia.
The evolution of cetaceans is thought to have begun in the Indian subcontinent from even-toed ungulates (Artiodactyla) 50 million years ago (mya) and to have proceeded over a period of at least 15 million years. [2] Cetaceans are fully aquatic marine mammals belonging to the order Artiodactyla and branched off from other artiodactyls around 50 mya.
The other members are Acrophyseter, Albicetus, Livyatan, and Zygophyseter, and these five whales have in common enamel-coated teeth in both the upper and lower jaws which were used in hunting large prey. [5] [8] These teeth are thought to have evolved in either a basilosaurid-like common ancestor, or multiple times independently in the group.
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