Crayfish Structure

Question 1

Rostrum

Answer 1

Pointed region between eyes.

Question 2

Antennae

Answer 2

Longer, paired appendages on head modified for chemosensory and tactile reception.

Question 3

Antennules

Answer 3

Shorter, paired appendages on head modified for chemosensory, tactile and equilibrium reception.

Question 4

Compound eyes

Answer 4

Small, dark sense organs for detecting light and forming visual images.

Question 5

Swimmerets

Answer 5

Abdominal appendages modified for swimming.

Question 6

Telson and Uropods

Answer 6

Broad, fan-shaped region of body used for rapid movement and for directional control during leisurely locomotion.

Question 7

Chelipeds

Answer 7

Large pinchers used for grasping food and for defense.

Question 8

Walking legs

Answer 8

Locomtion appendages

Question 9

Gastric Muscles

Answer 9

These move the cardiac stomach.

Question 10

Green Glands

Answer 10

Paired excretory organs found along the ventral margin of the head region; the release waste out of the crayfish through small pores in the ventral body wall.

Question 11

Digestive Glands

Answer 11

Accessory digestive organs that secrete enzymes into the pyloric stomach to facilitate chemical breakdown of food.