BISC 316 Study Guide - Dermis, Lungfish, Devonian

• School: Simon Fraser University
• Department: Biological Sciences
• Course: BISC 316
• Professor: Tammy Mc Mullan

Document Summary

Spends a year in water in larval stage. Vertebrate cartilaginous elements on dorsal surface of notochord. Larval form of lamprey very similar to ancestral body plan of vertebrates. Head joint to body by hinge in armor (can tilt head up) Jaws enlargement and adaptation of a visceral arch larger, harder food. Teeth anchored to skin at margin of jaws. Streamlined bodys, large eyes, wide mouth with many teeth, bony head, small hard scales. Evolved from an ancestor common with acanthodian 400 mya. Either have a lung or gas bladder for bouncy. Major influence on evolutionary success of an organism. Mid carboniferious first amniote, first no amniotic egg sac reptile to have amniotic eggs. Late carboniferous amniotes splits into ancestors of mammals and birds/reptiles. Late permian mass extinctions 95% of all marine species. Body shapes a lot diff body shape means basic biology is different. Heavily armored headshield and smaller plates on body.