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Chapter 24 Vocab

Chapter 24: A Closer Look at Arthropods

TermDefinition
Arthropod an invertebrate animal with an exoskeleton made of chitin; a series of paired, jointed appendages; and segmented body parts
Exoskeleton an external skeleton that supports the animal’s tissues against gravity
Chitin a long organic molecule made of sugars that is arranged in layers
Appendage an extension of an organism’s body
Segmentation describes how an arthropod’s body parts are divided into similar sections that have each evolved for a different function
Crustacean a group of arthropods that have two distinct body sections, a hard exoskeleton, two pairs of antennae, and one pair of appendages per segment
Cephalothorax the region of an organism in which the head and trunk region are combined into one long section
Abdomen refers to the rear portion of the organism
Carapace covers the sides of the body and protects the gills
Mandible highly adapted appendages that crush and bite food before ingestion
Chelicerate arthropods that lack antennae and have six pairs of appendages, which include four pairs of walking legs
Arachnid a terrestrial group of chelicerates characterized by eight legs, fanglike pincers that inject venom, and the ability to produce silk
Book Lungs are structures built of many thin, hollow sheets of tissue that look like the pages of a book
Spiracle tiny holes on the abdomen that open and close to allow oxygen to enter
Trachea carry oxygen directly to the arachnid’s tissues
Incomplete Metamorphosis 3 stages: egg, nymph stage, and adult (young insects look like adults)
Complete Metamorphosis 4 stages: larva, pupa, adult, egg (young insets do not look like adults)
Pupa inactive form in complete metamorphosis
Insecticide a chemical compound that kills insects and other arthropods
Vector an organism that carries a disease from one host to another
Created by: SavanahT
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