IA MODIFIED MASTERING BIOLOGY WITH E TEX
IA MODIFIED MASTERING BIOLOGY WITH E TEX
12th Edition
ISBN: 9780136781752
Author: Urry
Publisher: PEARSON
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Chapter 32.4, Problem 1CC
Summary Introduction

To describe: The evidence that cnidarians share a more recent common ancestor with other animals than with sponges.

Concept introduction: Sponges belong to a phylum called porifera. They have cellular level of organization that is their body is made up aggregates of cells. They have pores in their whole body. These pores help in exchange of nutrient and also remove waste materials. Sponges are primitive animals that diverged from other animals early in the evolution. Certain recent studies have concluded that the sponges are monophyletic.

Cnidaria is a phylum that contains approximately 10,000 species of animals. The animals in this group are usually aquatic (freshwater and marine). They possess a specialized cell called cnidocyte. The cnidocyte helps in capturing prey. The cnidarians are radially symmetrical and have tissue level of organization.

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Describe the evidence that cnidarians share a more recentcommon ancestor with other animals than with sponges.
compare cnidarians to sponges and to the clade containing flatworms, mollusks, and annelids. What features are similar among these groups? What features are different?
Draw a phylogenetic diagram showing only the interrelationships among the following clades: Tetrapoda, Lissamphibia, Amniota, Diapsida, Synapsida, Turtles, Archosauria
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