Chapter 32.1, Problem 1R

Summary Introduction

To review:

The common developmental stages, which are found in all deuterostomes. Also, the reason for the invalidation of some of these traits as a strong evidence for the monophyly of deuterostomes.

Introduction:

Deuterostomes are the class of organisms, which include sea animals like echinoderms and hemichordates, as well as land animals like chordates, including man himself. All these groups of animals do not share morphological characters. Yet, they are similar on the basis of developmental traits, which classify them under deuterostomes.