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.