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= ﻿﻿ ﻿ ﻿ ﻿ Did You See That Unicorn?! =

1. What phylum do crayfish belong to? Arthropods 2. What three characteristics do crayfish share with all other arthropods? Jointed legs, segmented bodies, and as exoskeleton 3. What group of arthropods do crayfish belong to? Crustaceans 4. What are two characteristics of crustaceans? Two antennae's and jaws 5. Name six other crustaceans. Crabs, lobsters, shrimp, barnacles, pill bugs, and water fleas. 6. How many antenna does a crayfish have and what are they used for? two, used for crushing food 7. How many legs does a crayfish have? 8 8. How many claws? 2 9. What are the claws called? Chelipod 10. What are the claws used for? Catching and holding food 11. How many walking legs? 4

12. How many swimmeretes and what three things are they used for? 5 pairs of swimmerets, used to help move and are used in reproduction. Also used to force water over the gills to help them breath. 13. What two tail structures are used for swimming? Uropod and Telson 14. How many mouthparts does the crayfish have? A wide variety 15. What are the mouthparts used for? Handling and eating food 16. What organs in the crayfish are used for digestion? Cardiac stomach, stomach, green gland, digestive gland, midgut, and intestine. 17. What organs are used for circulating blood? breathing? Heart and dorsal artery for circulating blood, gills for breathing 18. What organs send nerve impulses through the body? Brain and ventral nerve cord send nerve impulses. 19. What is the function of the ovaries? Produce eggs 20. What is the function of the anus? Gets rid of waste 21. What is the function of the flexor muscles? Used to move tail when swimming backwards 22. Why is a crayfish classified as an invertebrate? Because of similar characteristics 23. List all the animals we have dissected so far from simplest to most complex and list what phylum each animal is in.

Oyster- cephalopod, Crayfish- Arthopod, Grasshopper- Arthopod, Mollusk- Mollusk