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Chapter 28: Q. 17 (page 776)

Crustaceans are _____.

a. ecdysozoans

b. nematodes

c. arachnids

d. parazoans

Short Answer

Expert verified

Option a is the correct answer.

Step by step solution

01

Introduction

There are a staggering number of species in the superphylum Ecdysozoa. This is because the Phylum Arthropoda and the Phylum Nematoda, two of the most diverse animal phyla, are present (the arthropods).

02

The explanation for the correct answer.

Crustaceans, a subphylum of the phylum Arthropoda that includes creatures like lobsters, shrimp, barnacles, and crabs, are one example.

03

The explanation for the incorrect options.

  • Nematodes, or roundworms, are members of the phylum Nematoda, whereas crustaceans are members of the phylum Arthropoda.
  • Arachnids are a class that are distinct from crustaceans since they are members of the phylum Arthropoda and the subphylum Chelicerata.
  • A subkingdom of ancient creatures is known as the parazoans.

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Most popular questions from this chapter

The nematode cuticle contains _____.

a. glucose

b. skin cells

c. chitin

d. nerve cells

Cubozoans are ________.

a. polyps

b. medusoids

c. polymorphs

d. sponges

Explain the function of nematocysts in cnidarians.

Mesohyl contains:

a. a polysaccharide gel and dead cells.

b. a collagen-like gel and suspended cells for various functions.

c. spicules are composed of silica or calcium carbonate.

d. multiple pores.

The rhynchocoel is a ________.

a. circulatory system

b. fluid-filled cavity

c. primitive excretory system

d. proboscis
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