Campbell Biology (10th Edition)
Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321775658
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Chapter 34, Problem 34.1CR

Describe likely features of the common ancestor of chordates, and explain your reasoning.

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Summary Introduction

To explain: Likely features of common ancestor of chordates.

Concept introduction:

Deuterostomes are the likely ancestors of the Chordates. Deuterostomes consists of Echinoderms, Cephalochordates, Urochordates and many more phylums. They do not look physiologically like chordates but are genetically very similar.

Explanation of Solution

The features of the common ancestors of chordates are the presence of dorsal nerve cord and notochord. They possess pharyngeal slits that function as gills of fish. They also possess a muscular tail that surpasses the anus. The symmetry is bilateral as the cord passes through the center.

Conclusion

The modern-day chordate possess various features same as their ancestors. Presence of the nerve cord and muscular layering over it are seen in the ancestors, the features that are now fully developed in phylum Chordata.

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Name the two groups of nonvertebrate chordates.
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Campbell Biology (10th Edition)

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