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

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Biology 28 2 groups of arthropods