Biology Chapter 28-2 Flashcards

Questions and Answers

How are arthropods classified?

Arthropods are classified based on the number and structure of their body segments and appendages, specifically their mouthparts.

What are the distinguishing features of crustaceans?

They have two pairs of branched antennae, two or three body sections, and chewing mouthparts called mandibles.

What are the distinguishing features of chelicerates?

They have mouthparts called chelicerae, two body sections, and nearly all have four pairs of walking legs.

What are the distinguishing features of uniramians?

They have jaws, one pair of antennae, and unbranched appendages. Signup and view all the answers

What is a cephalothorax?

Formed by fusion of the head with the thorax. Signup and view all the answers

Where is the thorax located?

Lies just behind the head and houses most of the internal organs. Signup and view all the answers

What is the abdomen?

Posterior part of the body. Signup and view all the answers

What is a carapace?

Part of the exoskeleton that covers the cephalothorax. Signup and view all the answers

What is a mandible?

The mouthpart adapted for biting and grinding food. Signup and view all the answers

What are chelipeds?

The first pair of legs in crayfishes; they bear large claws that are modified to catch, pick up, crush, and cut food. Signup and view all the answers

What are swimmerets?

Flipperlike appendages used for swimming. Signup and view all the answers

What is a chelicera?

Contains fangs and is used to stab and paralyze prey. Signup and view all the answers

What are pedipalps?

Longer than the chelicerae and are usually modified to grab prey. Signup and view all the answers

What are spinnerets?

Organs that contain silk glands. Signup and view all the answers

Study Notes

Classification of Arthropods

Classified based on body segments and appendages, including mouthpart structure.

Distinguishing Features of Crustaceans

Possess two pairs of branched antennae.
Body consists of two or three sections.
Chewing mouthparts known as mandibles.

Distinguishing Features of Chelicerates

Characterized by mouthparts called chelicerae.
Body divided into two sections.
Typically have four pairs of walking legs.

Distinguishing Features of Uniramians

Possess jaws and a single pair of antennae.
Have unbranched appendages.

Cephalothorax

Formed by the fusion of the head and thorax.

Thorax

Located behind the head, housing most internal organs.

Abdomen

The posterior part of the arthropod body.

Carapace

A part of the exoskeleton that protects the cephalothorax.

Mandible

A specialized mouthpart adapted for biting and grinding food.

Chelipeds

The first pair of legs in crayfish.
Equipped with large claws for capturing and processing food.

Swimmerets

Flipperlike appendages utilized for swimming activities.

Chelicera

Contains fangs, employed for stabbing and paralyzing prey.

Pedipalps

Longer than chelicerae, usually modified for grasping prey.

Spinnerets

Organs that contain silk glands, crucial for silk production.

Description

Test your knowledge on the classification of arthropods and their distinguishing features with these flashcards. The focus is on crustaceans and chelicerates, exploring their body structure and specialized appendages. Perfect for students looking to reinforce their understanding of this essential biology concept.