Fish jaw
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Most bony fishes have two sets of jaws made mainly of bone. The primary oral jaws open and close the mouth, and a second set of pharyngeal jaws are positioned at the back of the throat. The oral jaws
Oral jaw from side and above of Piaractus brachypomus, a close relative of piranhas
Sailfish, like all billfish, have a rostrum (bill) which evolved from the upper jawbone
The paddlefish has a rostrum packed with electroreceptors
Sawfish have an electro-sensitive rostrum (saw) which is also used to slash at prey
Evolution of fish
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Fish began evolving about 530 million years ago during the Cambrian explosion. It was during this time that the early chordates developed the skull and the vertebral column, leading to the first crani
Lamprey mouth
†Spiny sharks (extinct) were the earliest known jawed fish. They resembled sharks and were ancestral to them.
Dunkleosteus skull steveoc
Dunkleosteus Sannoble