| A | B |
|---|
| arthropods | any member of the phylum Arthropoda |
| appendages | jointed extensions such as legs and antennnae |
| compound eyes | eyes composed of many individual light detectors |
| molting | the process by which and arthropod grows |
| crustaceans | arthropods that have branched antennae and a pair chewing mouthparts |
| mandibles | a pair of chewing mouthparts in crustaceans |
| chelicerae | pincerlike mouthparts |
| nauplius | free-swimming larva of crustaceans |
| plankton | the collection of small organisms that drift or swim weakly near the surface of a body of water |
| isopods | terrestrial crustaceans |
| decapods | crustaceans with 5 pairs of feet |
| cephalothorax | the head adn the thorax of a crustacean |
| thorax | the part of the body between the head and the abdomen |
| carapace | tough covering over the cephalothorax in some crustaceans |
| abdomen | the tagma that lies posterior to the cephalothorax |
| telson | the 7th adominal segment that forms a flat paddle at the posterior end of a crayfish |
| antennules | feelers sensitive to touch, taste, and equillibrium |
| antennae | feelers that respond to touch and taste |
| maxillae | a head appendage in arthropods that is used to manipulate food |
| maxilliped | a thoracic appendage in arthropods that is used to manipulate food and to detect touch and chemicals |
| chelipeds | the most anterior pair of appendages on the thorax |
| swimmerets | create water currents and function in reproduction |
| uropods | help propel the crayfish during tailflips |
| green glands | excretory organs in crayfish |
| myriapods | "many feet" |
| arachnids | members of the class Arachnida, including spiders, scorpions, mites, and ticks |
| pedipalps | aid in holding food and chewing |
| spinnerets | an organ in spiders that connect the silk glands to the abdomen |
| book lungs | paired sacs in the abdomen where respiration occurs |
| tracheae | these carry air directly to the tissues |
| spiracles | openings in the exoskeleton which allow air in |
| Malpighian tubules | hollow projections of the digestive tract that collect body fluids and wastes and carry them to the intestine |
| coxal glands | organs that remove wastes and discharge them through the openings at the base of some legs |
