This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
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....
View Full Document
- Fall '08
- Sarcopterygii, Tetrapod, adult form