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Name: ___________________________ Block: _______ Date: ___________________________ BIOLOGY 11 CRAYFISH LAB Purpose : You are responsible for writing your own purpose. Procedure: 1. Remove all the appendages from one side of the crayfish. Sketch these in order from anterior to posterior. Name each appendage. Briefly describe the function of each set of appendages. This answer must be in chart form. 2. Use scissors to cut the crayfish’s carapace in half from posterior to anterior. Remove the carapace and continue to cut towards the head and remove the shell. Sketch the internal anatomy, dorsal view. Label the gills, heart digestive glands, stomach, and reproductive organs. 3. Remove on of the compound eyes and look at it under the dissecting microscope. Sketch it and label the eye and stalk. Materials: Include all the materials used in this lab. Observations: The observations should include: the chart of external structures the sketch of internal structures (dorsal view) the sketch of the compound eye Discussion: 1a) Describe the digestive system in the crayfish. b) Why does the crayfish have such a short intestine? 2a) Describe the location of the gills. b) Why are the gills attached to the legs? 3. Why is it that having its eye on the end of a stalk is an adaptive advantage for the crayfish? 4a) What is the function of the green gland? b) Why is it located where it is? Name: ___________________________ Block: _______ Date: ___________________________ BIOLOGY 11 5. Which structures adapt the crustacean to a fresh water lifestyle rather than a) a marine lifestyle? b) a terrestrial lifestyle? 6. What are three functions of the crayfish antennae? 7. What are the five (5) distinguishing characteristics of crustaceans? Conclusion: What sex was your crayfish? How can you tell a male crayfish from a female crayfish? What type of circulatory system does a crayfish possess? How can you tell? How does the heart work? Why does the crayfish have a digestive gland when it already has an intestine? What is the purpose of the chitonous teeth in the crayfish’s stomach?