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Unformatted text preview: cartilage (even denser) Lobe-finned fish (coelacanths) o Were originally though to be extinct. o Extinct everywhere else but the east shore of Africa and Indonesia o They paddle their fins (same bone structure as rest of the fishes). o Thought to have future that could go on land. original theory was that this transition took place in the tropics o Tetrapods includes human more closely related to coelacanths than any other fish Bony fish (teleost) o Have dipples that detect changes in pressure. similar to ear drums o Swim blader: a gas bubble used by bony fish to go up in the water without having to swim and use energy Tiktaalik roseae: fosil that represents the kind of organism that probably fist made it to land o Found in Canada....
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This note was uploaded on 01/26/2012 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.
- Fall '08