Chapter 28 Biology
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Marley12295 on April 24, 2011
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29 terms
Terms | Definitions |
|---|---|
 exoskeleton | 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 |
| chitin | a tough semitransparent horny substance |
| appendage | a part that is joined to something larger |
| tracheal tube | one of many branching, air-filled tubes that extend throughout the bodies of many terrestrial arthropods |
| spiracle | a breathing orifice |
| book lung | organ in many arachnids containing many thin folds of membrane resembling the leaves of a book |
| Malpighian tubule | saclike organ in most terrestrial arthropods that extracts wastes from the blood, adding them to feces that move through the gut |
| molting | periodic shedding of the cuticle in arthropods or the outer skin in reptiles |
| cephalothorax | region of a crustacean formed by the fusion of the head with the thorax |
| thorax | part of an insect's body that bears the wings and legs |
| abdomen | the region of the body of a vertebrate between the thorax and the pelvis |
| carapace | hard outer covering or case of certain organisms such as arthropods and turtles |
| mandible | the lower jawbone in vertebrates |
| cheliped | one of the first pair of legs of decapods |
| swimmeret | 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 |
| chelicera | either of the first pair of fang-like appendages near the mouth of an arachnid |
| pedipalp | pair of mouthparts in chelicerates that are usually modified to grab prey |
| spinneret | organ in spiders that contains silk glands |
| incomplete metamorphosis | insect development consisting of three stages: egg, nymph, and adult |
| nymph | a larva of an insect with incomplete metamorphosis (as the dragonfly or mayfly) |
| complete metamorphosis | Insect development consisting of four stages: egg, larva, pupa, and adult |
| pupa | an insect in the inactive stage of development (when it is not feeding) intermediate between larva and adult |
| pheromone | a chemical substance secreted externally by some animals (especially insects) that influences the physiology or behavior of other animals of the same species |
| society | an extended social group having a distinctive cultural and economic organization |
| caste | a social class separated from others by distinctions of hereditary rank or profession or wealth |
| endoskeleton | the internal skeleton |
| water vascular system | system of fluid-filled tubes used by echinoderms in locomotion and feeding and respiration |
| tube foot | 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 |
| madreporite | sievelike structure through which the water vascular system of an echinoderm opens to the outside |
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