BIOL359 Lecture Notes - Tetrapod, Transitional Fossil
4 Apr 2014
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Hmmm. : need transitional form fossils for the wales, sabara dessert: used to be a sea (mediattarian sea) but now sand (valley of wales) scattered across land is wale skeletons. But happened to find something modern wales have lost: wales have leg bones- pelvis, knee cap, and toes (complete set of leg bones) walves was once 4 legged animal. Earliest ancestor of walves was this wolf like creature: synonix: front legs became fins, back legs disspeared, lost fur. Andotetious, lotocedious, durodon as well as beslaosrious all transitional forms. Found in stream bed so probably lived in water with limbs. So tetrapods had the limbs first and then left the water maybe. It was thought that fish came out of water and then developed the fins but the fossils are something that the limbs came first. Found a array of bones at the end of the limb which was a hand. Limbs were already evolved in the water.
