Apologia Biology, 2nd edition, Module 12

exoskeleton

a body covering, typically made of chitin, that provides support and protection

molt

to shed an old outer covering so that it can be replaced with a new one

thorax

the body region between the head and the abdomen

cephalothorax

a body region composed of the head and thorax fused together

compound eye

an eye made of many lenses, each with a very limited scope

simple eye

an eye with only one lens

open circulatory system

a circulatory system that allows the blood to flow out of the blood vessels and into various body cavities so that the cells are in direct contact with blood

statocyst

the organ of balance in a crustacean

gonad

a general term for the organ that produces gametes

complete metamorphosis

insect development consisting of four stages: egg, larva, pupa, and adult

incomplete metamorphosis

insect development consisting of three stages: egg, nymph, and adult