Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 24 - Self-Quiz - Page 413: 3


a. protostomes

Work Step by Step

Protostomes are organisms whose mouths originate from the first opening that develops in the embryo. In contrast, deuterostomes have mouths formed from the second opening that developed in the embryo. Many bilateral invertebrates such as flatworms, annelids, mollusks, roundworms, and arthropods are protostomes. Vertebrates are all deuterostomes. Only animals with bilateral symmetry can be either protostomes and deuterostomes; animals with radial symmetry are neither.
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