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the exterior protective or supporting structure or shell of many animals (especially invertebrates) including bony or horny parts such as nails or scales or hoofs
one of many branching, air-filled tubes that extend throughout the bodies of many terrestrial arthropods
organ in many arachnids containing many thin folds of membrane resembling the leaves of a book
saclike organ in most terrestrial arthropods that extracts wastes from the blood, adding them to feces that move through the gut
one of the paired abdominal appendages of certain aquatic crustaceans that function primarily for carrying the eggs in females and are usually adapted for swimming
an insect in the inactive stage of development (when it is not feeding) intermediate between larva and adult
a chemical substance secreted externally by some animals (especially insects) that influences the physiology or behavior of other animals of the same species
a social class separated from others by distinctions of hereditary rank or profession or wealth
water vascular system
system of fluid-filled tubes used by echinoderms in locomotion and feeding and respiration
tentacular tubular process of most echinoderms (starfish and sea urchins and holothurians) having a sucker at the end and used for e.g. locomotion and respiration
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