Sharks
Sharks
Sharks belong to cartilaginous fishes. The name descends out of the Icelandic and means “hook”, which refers to the hook-shaped tail fin of these fishes.
The eldest known Shark fossils are from the Devonian era, about 400 Million years ago.

Sharks have a revolver dentition, which renews itself constantly. Behind every foremost tooth are several new teeth in order, which move up bit by bit. This leads to an enormous number of teeth a shark builds and looses during a lifetime.

Shark teeth are collected and used by humans over a thousand of years because of their frequency and characteristic shape. For example as spearheads and jewellery.
 

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Orthacanthus senckenbergianus(Carboniferous, Permian)
 

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