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Name: _____________________________________ 1. Arthropods are characterized by their ______segmented_________________ body. Also their body segments bear jointed extensions called ______appendages_________________. 2. Another distinguishing feature of arthropods is their _______exoskeleton___________________. It provides protection and support. It is composed of _____3_____ layers . Describe the layers and of what they are composed. Waxy outer layer- water repeling and prevents dessication Middle layer- chitin and protein and sometimes, calcium carbonate- strength Inner layer- protein and chitin- flexibility; anchoring of muscles 3. Arthropods exhibit a high degree of cephalization. Most arthropods have _____compound____ eyes. Can you think of how this can be an advantage? Multifaceted- improves detail, light detectors 4. Arthropods have an _____open___ circulatory system. How is this system different from a closed system? Open: heart pumps blood to some vessels to open cavities where tissues are bathed in hemolymphcollected and circulated back to heart Closed: heart- to vessels- back to heart 5. Describe the molting process. Shedding of exoskeleton and making a new one 6. Arthropods are usually divided into ____5___ subphyla. Which subphyla is extinct? Trilobites 7. Indentify the difference between chelicerae and mandibles. Chelicerae- Pincers Mandibles- jaws 8. Please list 5 examples of animals for both divisions (having mandibles and having chelicerae). 9. The diversity of crustaceans is immense. Describe the few things that all crustaceans have in common. Two pairs of antennae; most have mandibles 10. Describe the larval stage that all have in common. What is it called? Nauplius- free swimming larval stage; three pairs of appendages and central eye 11. Please give examples of crustaceans that live on the land and live in the water. Isopods, copepods 12. Why are copepods important? Can you think of another organism that depends upon them for survival? Source of plankton; Blue Whale 13. Isopods (a terrestrial crustacean) live in moist environments. How is their exoskeleton adapted or lacking in adaptations for this environment? Lacks waxy coating; needs to live in moist environment so as not to dry out 14. Please observe the remnants of the lobster on display. Can you compare the lobster parts with the crayfish, a freshwater crustacean? Can you identify the parts. a. Cheliped; cephalothorax; abdomen; uropod; telson 15. The subphylum Chelicerata include spiders, ticks and mites. What characteristics do they have? Lack of antennae; six pairs of appendages; chelicerae; pedipalps; four pairs of walking legs 16. Can you compare the respiratory organs responsible for gas exchange (intake oxygen and discharge carbon dioxide ) with crayfish, spiders and grasshoppers? a. Crayfish- gills; spiders- book lungs; grasshoppers- tracheae 17. What are pedipalps? a. Aid in holding food and chewing 18. What are spinnerets? In what animal are these found? a. Organs that aid in making silk; found in spiders 19. Compare the excretory organs of crayfish and spiders. Crayfish- green glands; Spiders- malpighian tubules 20. Name the two venomous spiders in the United States. Can you draw them? a. Black Widow and Brown Recluse