Shark

Hexanchiformes

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Squaliformes

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Pristiophoriformes

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Squatiniformes

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Heterodontiformes

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Orectolobiformes

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Carcharhiniformes

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Lamniformes

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Sharks are a group (superorder Selachimorpha) of fish, with a full cartilaginous skeleton, a streamlined body plan with between 5 and 7 gill slits along the sides (most often) or side of the head (the first modified slit is behind the eye and called a spiracle), dermal denticles covering the body to protect from parasites, and rows of replaceable teeth in the mouth.

Related Topics:
Superorder - Fish - Cartilaginous - Skeleton - Streamline - Gill - Head - Eye - Spiracle - Body - Parasite - Teeth - Mouth

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