Loose Leaf For Integrated Principles Of Zoology
Loose Leaf For Integrated Principles Of Zoology
18th Edition
ISBN: 9781260411140
Author: Cleveland P Hickman Jr. Emeritus, Susan L. Keen, David J Eisenhour Professor PhD, Allan Larson, Helen I'Anson Associate Professor of Biology
Publisher: McGraw-Hill Education
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Chapter 20, Problem 1RQ
Summary Introduction

To list: The appendages on the head of the crustacean.

Introduction: Animal kingdom is vast which is divided on the basis of the properties possessed by the animal species. Arthropods have segmented body parts which are called appendages, each having a specialized role.

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Arthropods are the invertebrate species that are evolved to having a segmented body and exoskeleton. The arthropods have specialized appendages and structures present on their head. The appendages found on the head are:

  • Two Antennae
  • Mandible (Jaw)
  • Maxillae(Accessory Jaws)

These specialized structures present on the head helps them in sensing and locomotory activities.

Summary Introduction

To describe: The dissimilarity between crustaceans and other arthropods.

Introduction: Structural and morphological development in the life stages of arthropods are the basic parameters on which these species are classified. Arthropods and crustaceans have more similarities than differences which can be seen in their stages of life.

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Explanation of Solution

The body of arthropod consists of three segments with a hard exoskeleton and jointed appendages; these appendages further make head, thorax, and abdomen. The head has two pairs of antennae, one pair of mandibles, and two pairs of maxillae.

Among the Phylum Arthropoda, only crustaceans have two pairs of antennae, which makes all the crustaceans distinctive among the Arthropods.

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Students have asked these similar questions
List the appendages on the head of a crustacean. What other important characteristics of Crustacea distinguish them from other arthropods?
Discuss the body plans exhibited by the crustaceans that are also shared by all other arthropods. What characteristics are autapomorphic to the crustaceans?
What activities and body functions of arthropods require the most specialized appendages?
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