Names: ____________________________, _________________________________, ______________________________
Date: 05/24/10
Pre-lab questions:
1. What type of skeleton does your specimen have? ___________________________
2. How many pairs of appendages does the head region have? _____________
3. What three jobs does the antennules perform? ___________, __________________, & _____________________
4. What are the large claws named that crayfish use for defense and to capture prey? __________________________
5. What does a crayfish prey upon? (What does it eat?) ________________________________________________________
External Dissection Lab Sheet:
Mrs. Slechta will check off if correct!
1. Place your specimen on its dorsal side up in the dissection tray. _______
2. Circle the symmetry of your specimen: RADIAL, BILATERAL, or ASYMMETRICAL
3. Determine the sex of your crayfish. Male _____ or Female _______
Explain how you KNOW: _____________________________________________________________________________________________
4. Proper identification of:
WALKING LEG_____ SWIMMERET _____ CHELIPED_____ GILLS _____
