Metazoa%20Study%20Guide

Metazoa%20Study%20Guide - BIS2C Winter 2010 BIS2C Study...

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BIS2C Winter 2010 1 BIS2C Study Guide: Metazoans Trees as road maps Be familiar with the phylogenetic relationships of the major clades of animals, and the distribution of characters on the tree. Practice drawing trees in which you label both taxa and traits. In your textbook ( Life , 8 th edition) the following are useful summary trees: Figures 31.1, 32.1, and 33.1. With respect to Figure31.1 (overview of relationships among major animal groups) be aware of how recent molecular phylogenetic studies are changing this picture. Take the characteristics of each major group of animals (with respect to body form, presence/absence of gut, nervous system, reproduction, etc.) and summarize this information in a taxon by character matrix. Then plot the characters on a tree (or trees). Other visual aids It often helps to think visually about the kinds of animals distributed across these trees. For “Cnidaria” think of corals, sea anemones and sea jellies. For “Lophotrochozoa” think of a mollusk or an annelid (but remember that there are quite a few other groups in this clade that we
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Metazoa%20Study%20Guide - BIS2C Winter 2010 BIS2C Study...

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