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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

Echinoderms have _____.

a. triangular symmetry

b. radial symmetry

c. hexagonal symmetry

d. pentaradial symmetry

Which of the following statements about the anatomy of a mollusk is false?

a. Mollusks have a radula for grinding food.

b. A digestive gland is connected to the stomach.

c. The tissue beneath the shell is called the mantle.

d. The digestive system includes a gizzard, a stomach, a digestive gland, and the intestine.

The rhynchocoel is a ________.

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Which group of flatworms are primarily ectoparasites of fish?

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b. trematodes

c. cestodes

d. turbellarians

The circulatory fluid in echinoderms is _____.

a. blood

b. mesohyl

c. water

d. saline
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