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Biology 28 2 groups of arthropods
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Biology 28 2 groups of arthropods

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  • 1. 28-2 Groups of Arthropods
  • 2. Cephalothorax
    Region of a crustacean formed by the fusion of the head with the thorax.
  • 3. thorax
    Body part of a crustacean that lies just behind the head and houses most of the internal organs
  • 4. Abdomen
    Posterior part of an arthropod’s body
  • 5. carapace
    In crustaceans, the part of the exoskeleton that covers the cephalothorax; in turtles and tortoises, the dorsal part of the shell
  • 6. mandible
    Mouthpart adapted for biting and grinding food
  • 7. Cheliped
    One of the first pair of legs of decapods
  • 8. swimmeret
    Flipper- like appendages used by decapods for swimming.
  • 9. chelicerae
    Pair of mouthparts in chelicerates that contain fangs and are used to stab and paralyze prey.
  • 10. pedipalps
    Pair of mouthparts in chelicerates that are usually modified to grab prey.
  • 11. Spinneret
    Organ in spiders that contains silk glands
  • 12. Key concept
    Arthropods are classified based on the number and structure of their body segments and appendages- particularly their mouthparts.
  • 13. Key Concept
    Crustaceans typically have two pairs of antennae, two or three body sections, and chewing mouthparts called mandibles.
  • 14. Key Concept
    Chelicerates have mouthparts called chelicarae and two body sections, and nearly all have four pairs of walking legs.
  • 15. Key Concept
    Uniramians have jaws, one pair of antennae, and unbranched appendages.