| A | B |
|---|
| arthropod | member of a group of invertebrates characterized by segmented bodies, jointed appendages, and exoskeletons |
| thorax | midsection of an arthropod |
| jointed appendage | appendage with joints, or points where it can bend |
| exoskeleton | hard external skeleton; characteristic of some invertebrates |
| chitin | polysaccharide in arthropod exoskeletons |
| molting | process of shedding an old exoskeleton (in arthropods) or skin (in reptiles) and producing a new one |
| ganglia | clusters of nerve cell bodies found along the nerve cords of some animals |
| compound eye | eye with many facets, each with its own lens |
| trachea | in some arthropods, chitin-lined air tube that forms part of the respiratory system |
| spiracle | hole in an arthropod's exoskeleton that allows the exchange of carbon dioxide and oxygen |
| crustacean | member of a group of arthropods that includes lobsters, crabs, crayfish, shrimp, and barnacles |
| arachnid | member of a group of arthropods that includes spiders, scorpions, mites, and ticks |
| insect | member of a group of arthropods that includes beetles, ants, butterflies, bees, and many others |
| cephalothorax | fused head and thorax characteristic of arachnids and some crustaceans |
| chelicera | fanglike mouthpart characteristic of arachnids |
| pedipalp | mouthpart characteristic of arachnids that is used to manipulate prey |
| malgighian tubule | excretory structure that works with the gut in reducing water loss in land arthropods |
| book lung | respiratory structure found in many arachnids |
| spinneret | organ in a spider's abdomen that spins silk into fibers |
| carapace | hard shield reinforced with calcium carbonate that covers the back of a decapod's cephalothorax |
| mandible | hard mouthpart used to bite and grind food, characteristic of decapods and some insects |
| pupa | transition stage between larva and adult in insects with complete metamorphosis |
| entomology | the study of insects |
| biological control | control of pest organisms by interfering with their natural ecological interactions, as in introducing predators |
