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Any fossils, including fossil shark teeth, are preserved in sedimentary rocks after falling from their mouth. [13] The sediment that the teeth were found in is used to help determine the age of the shark tooth due to the fossilization process. [15] Shark teeth are most commonly found between the Upper Cretaceous and Tertiary periods. [16]
The shark was an opportunist and piscivorous, and it would have also gone after smaller fish and other sharks. [52] Many whale bones have been found with deep gashes most likely made by their teeth. [ 28 ] : 75 Various excavations have revealed megalodon teeth lying close to the chewed remains of whales, [ 28 ] : 75 [ 30 ] and sometimes in ...
The anterior teeth of C. vraconensis measure 2.1–3.5 centimeters (0.8–1.4 in) in height, [8] while the largest known tooth of C. denticulata measures 3 centimeters (1.2 in). [30] C. mantelli teeth are larger, measuring 3–4 centimeters (1–2 in) in average slant height. The largest tooth discovered from this species may have measured up ...
Some fish like carp and zebrafish have pharyngeal teeth only. [30] [31] Sea horses, pipefish, and adult sturgeon have no teeth of any type. In fish, Hox gene expression regulates mechanisms for tooth initiation. [32] [33] While both sharks and bony fish continuously produce new teeth throughout their lives, they do so via different mechanism.
Shark teeth are embedded in the gums rather than directly affixed to the jaw, and are constantly replaced throughout life. Multiple rows of replacement teeth grow in a groove on the inside of the jaw and steadily move forward in comparison to a conveyor belt; some sharks lose 30,000 or more teeth in their lifetime. The rate of tooth replacement ...
The difference in characteristics between the large and small O. compressus adult teeth might indicate sexual dimorphism. [ 7 ] The spines of O. platypternus showing 3 to 4 dentine layers are interpreted to be subadults or young adults, and are separated into two size classes where females have the largest spines in comparison to males ...
Two guys walk into a bar. The third one ducked. A photon goes to the airport. The ticket agent asks if there's any luggage to check. The photon replies, “No, I'm traveling light.”
All sharks and rays are cartilaginous fish, contrasting with bony fishes. Many rays are adapted for feeding on the bottom. Many rays are adapted for feeding on the bottom. Guitarfishes are somewhat between sharks and rays, displaying characteristics of both (though they are classified as rays).
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