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Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins tha
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- By contrast, most bony fish possess a homocercal caudal fin.
- This allows more efficient locomotion among these negatively buoyant cartilaginous fish.
- This is because the shark's vertebral column extends into that dorsal portion, providing a greater surface area for muscle attachment.
- Sharks possess a heterocercal caudal fin in which the dorsal portion is usually noticeably larger than the ventral portion.
- Caudal fin shapes vary considerably between shark species, due to their evolution in separate environments.
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- Tails provide thrust, making speed and acceleration dependent on tail shape.
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- For some species, dermal patterning returns to healed denticles even after they have been removed by injury.
- These markings are important for camouflage and help sharks blend in with their environment, as well as making them difficult for prey to detect.
- Some species of shark have pigmented denticles that form complex patterns like spots (e.g. Zebra shark) and stripes (e.g. Tiger shark).
- Their dermal teeth give them hydrodynamic advantages as they reduce turbulence when swimming.
- This works as an outer skeleton, providing attachment for their swimming muscles and thus saving energy.
- Unlike bony fish, sharks have a complex dermal corset made of flexible collagenous fibers and arranged as a helical network surrounding their body.
- because their fins do not allow them to move in the tail-first direction.
- Most sharks have eight fins. Sharks can only drift away from objects directly in front of them.
- Fin skeletons are elongated and supported with soft and unsegmented rays named ceratotrichia, filaments of elastic protein resembling the horny keratin in hair and feathers.
- In the rostrum (snout), the cartilage can be spongy and flexible to absorb the power of impacts.
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- The jaws of a large great white shark may have up to five layers.
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- Generally sharks have only one layer of tesserae, but the jaws of large specimens, such as the bull shark, tiger shark, and the great white shark, have two to three layers or more, depending on body size.
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- This gives these areas much of the same strength found in the bony tissue found in other animals.
- which are crystal blocks of calcium salts arranged as a mosaic.
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- It has a layer of tiny hexagonal plates called "tesserae",
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- The jaw's surface (in comparison to the shark's vertebrae and gill arches) needs extra support due to its heavy exposure to physical stress and its need for strength.
- The jaws of sharks, like those of rays and skates, are not attached to the cranium.
- Because sharks do not have rib cages, they can easily be crushed under their own weight on land.
- This reduces the skeleton's weight, saving energy.
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- Cartilage is flexible and durable, yet is about half the normal density of bone.
- Sharks and other cartilaginous fish (skates and rays) have skeletons made of cartilage and connective tissue.
- Shark skeletons are very different from those of bony fish and terrestrial vertebrates.
- The teeth of plankton-feeders such as the basking shark are small and non-functional.
- those that feed on fish have needle-like teeth for gripping, and those that feed on larger prey such as mammals have pointed lower teeth for gripping and triangular upper teeth with serrated edges for cutting.
- those that feed on mollusks and crustaceans have dense and flattened teeth used for crushing,
- Tooth shape depends on the shark's diet:
- which is observed in the cookiecutter shark.
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- In most species, teeth are replaced one at a time as opposed to the simultaneous replacement of an entire row,
- The rate of tooth replacement varies from once every 8 to 10 days to several months.
- some sharks lose 30,000 or more teeth in their lifetime.
- 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;
- and are constantly replaced throughout life.
- Shark teeth are embedded in the gums rather than directly affixed to the jaw,