Question

Crustaceans are _____.

a. ecdysozoans

b. nematodes

c. arachnids

d. parazoans

Short answer

Option a is the correct answer.

Step-by-step solution

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).

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.

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.