Lecture 18 Study Guide

Lecture 18 Study Guide - Lecture 18 Study Guide 1. What...

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Lecture 18 Study Guide 1. What differences do organisms face when switching from water to land? a. Aquatic habitat i. Has buoyancy, supports body ii. No body support on land b. Desiccation c. Density of surrounding media i. Water is denser 1. Allows swimming ii. Challenges of movement on land d. Light availability i. Better photosynthesis on land ii. Sunlight for warmth e. No suspended nutrients on land f. Sound and light behave differently g. O2 and CO2 easier to extract 2. What vertebrates illustrate fish/tetrapod transition? a. Coelacanth and lungfish b. In fossil record i. Osteolepiformes 1. Close to tetrapods 2. Bony scales ii. Eustenopteron 1. Choana (Internal naris) a. Nose open connected to mouth cavity b. Uniquely shared with tetrapods
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iii. Panderichthys 1. No fins on top or bottom 2. Streamline body, closer to tetrapod 3. 2 pairs muscular fins iv. Tiktaalik 1. Shoulder separation a. v. Acanthostega 1. Fins into limbs 2. Most basal tetrapod vi. Ichthyostega
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Lecture 18 Study Guide - Lecture 18 Study Guide 1. What...

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