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Otodus megalodon teeth are the largest of any shark, extinct or living, and are among the most sought after types of shark teeth in the world. This shark lived during the late Oligocene epoch and Neogene period, about 28 to 1.5 million years ago, and ranged to a maximum length of 60 ft. [ 13 ] The smallest teeth are only 1.2 cm (0.5 in) in ...
However, sharks continuously produce new teeth throughout their lives [3] [4] [5] via a drastically different mechanism. Shark teeth form from modified scales near the tongue and move outward on the jaw in rows until they are eventually dislodged. [6] Their scales, called dermal denticles, and teeth are homologous organs. [7]
Shark teeth are strong and made of enamel. Many sharks have 3 rows of teeth. These teeth are embedded in the gums, not the jaw. [10] Sharks are born with teeth that are constantly being replaced. Teeth are replaced every two weeks, approximately. [10] The shape of the teeth determine the diet of the shark.
New, permanent teeth grow in the jaws, usually under or just behind the old tooth, from stem cells in the dental lamina. [5] Young animals typically have a full set of teeth when they hatch; there is no tooth change in the egg. Within days, tooth replacement begins, usually in the back of the jaw continuing forward like a wave.
The anterior teeth have elongated crowns, with striations on the lingual face and small lateral cusplets. The lateral teeth are smaller and broader, with weaker striations. [5] S. macrota anterior teeth have smaller roots than S. striata, and they are often recurved. Another difference between these two species is the length of their teeth.
The video above, filmed by the Monterey Bay Aquarium Research Institute (MBARI), provides an amazingly close view of this odd-looking fish as it swims deep in the ocean.
Hybodonts were first described in the nineteenth century based on isolated fossil teeth (Agassiz, 1837). Hybodonts were first separated from living sharks by Zittel (1911). [1] Although historically argued to have a close relationship with the modern shark order Heterodontiformes, this has been refuted. [2]
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