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Chapter 28: Q. 39 (page 777)

Describe the different classes of echinoderms using examples.

Short Answer

Expert verified

Classes of phylum Echinodermata include Asteroids, Echinoidea, Ophiuroidea, Crinoidea, Holothuroidea,

Step by step solution

01

Step 1. Introduction

Echinoderms are members of the phylum Echinodermata.

Characteristics of Echinodermata:

  1. They appear like stars.
  2. They are exclusively marine.
  3. They have a celomic body.
  4. They are triploblastic.
02

Step 2. Explanation

Classes of phylum Echinodermata include Asteroids, Echinoidea, Ophiuroidea, Crinoidea, and Holothuroidea.

Classes with examples:

  • Asteroids - Sea stars
  • Echinoidea - Sea urchins
  • Ophiuroidea - Brittle stars
  • Crinoidea - Sea lilies and feather stars
  • Holothuroidea - Sea cucumbers.

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