9. Predicting Results What problem would a crayfish have if it were born without a green gland?

Observing Crayfish Behavior

Materials crayfish in container with water, tapping instrument

Procedure ^

CAUTION Crayfish have powerful pincers that could injure you. Do not place your hand near the crayfish.

1. Gently tap the anterior (head) end of the crayfish, and record your observations.

2. Tap the posterior (tail) end of the crayfish, and record your observations.

Analysis Describe each behavioral response you observed when you tapped the crayfish. How does each behavior aid the animal in its survival?

Subphyla Chelicerata and Myriapoda

Unlike crustaceans, nearly all members of the subphyla Chelicerata, Myriapoda, and Hexapoda are terrestrial.

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