Biological Science
Biological Science
5th Edition
ISBN: 9780321743671
Author: Scott Freeman
Publisher: PEARSON
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Chapter 35, Problem 14TYPSS
Summary Introduction

To review:

The hypothesis that explains the evolution of a simple body plan in Xenoturbella.

Introduction:

Xenoturbella is a genus of deuterostomes that show a very simple body plant. It has two layers of ciliated epithelium, which covers its gut and mouth. In these animals, the anus is absent. It is suggested that either they possess the characters of their early ancestors or they have lost typical morphological features of deuterostomes.

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