BIO152H5 Lecture Notes - Lecture 3: Amniote, Tiktaalik, Agnatha
Document Summary
Deuterostomes: b/c contains a flesh-y lobe that connects the fin to the body. Animal tracks were found dating back about 370 million years ago. Contain ribs that are massive and overlap. Little compression of the lungs: vertebrate. Skeleton needs to support its mucular structure. All structured in a way to support. These findings allow to understand the ecology of the animal: dug up on baffin island, facial structures similar to that of crocdiles, on the back scales, inside the animal ribs. A fossil in great condition easy to identify each part. We (humas) are scaropterygians logically and technically. Out of the vertebrates we belong to the smallest group. Hagfish are vertabrates: graph on time vs. angle of movement of terrestrials these fish, secrete a cloud of slime that clogs the gills of the predator, able to knot itself a feeding mechanism. Joint in the back of the skull within it- not sure what it does.
