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Chapter 29: Q. 23 (page 827)

What are the characteristic features of the chordates?

Short Answer

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The characteristic features of the phylum Chordata are a notochord, a dorsal hollow nerve cord, pharyngeal slits, a post-anal tail and an endostyle/thyroid gland.

Step by step solution

01

Introduction

Animals that possess bilateral symmetry can be divided into two groups—protostomes and deuterostomes—based on their patterns of embryonic development. The deuterostomes, consist of two major phyla: Echinodermata and Chordata. Chordates include the vertebrates and two invertebrate chordates: Cephalochordates and Urochordates.

02

Explanation

Animals in the phylum Chordata share five key characteristics that appear at some stage during their development: a notochord, a dorsal hollow (tubular) nerve cord, pharyngeal gill arches or slits, a post-anal tail, and an endostyle/thyroid gland. In some groups, some of these key characteristics are present only during embryonic development

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