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Unformatted text preview: immunity) 1. Sharks and rays - cartilaginous skeleton w/ some bones VI. Osteichthyans A. Evolution of bony endoskeleton 1. Ray finned fish - rudimentary lungs and swim bladder VII. Lobe-fins Lecture 17 – Chordates I A. Evolution of fins with rod-shaped bones supporting muscle 1. Coelacanth - thought extinct for 75 my B. Evolution of lungs or lung derivatives 2. Lung fish - have gills; survival terrestrial desiccation via estivating in mud VIII. Tetrapods A. Evolution of legs from lobe-finned lung fish 1. Tiktaalik fossil a. possess both tetrapod and fish characteristics; b. possess important intermediates 1. Fins with wrists 2. Head disconnected from shoulder (neck) 3. Expanded ribs...
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- Spring '11
- Sarcopterygii, Tetrapod, A. Evolution