CH 24 Flashcards
exoskeleton
an external skeleton that supports the animal’s tissues against gravity
Anthropod
an invertebrate animal with an exoskeleton made of chitin
chitin
a long organic molecule made of sugars
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
Crustaceans
a group of arthropods that have two distinct body sections
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
Mandibles
highly adapted appendages that crush and bite food before ingestion
Chelicerates
arthropods that lack antennae and have six pairs of appendages, which include four pairs of walking legs
Arachnids
are a terrestrial group of chelicerates characterized by eight legs, fanglike pincers that inject venom, and the ability to produce silk
Book Lungs
structures built of many thin, hollow sheets of tissue that look like the pages of a book
Spiracles
tiny holes on the abdomen that open and close to allow oxygen
Tracheae
carry oxygen directly to the arachnid’s tissues
Incomplete metamorphosis
They have six legs and a head, thorax, and abdomen, but they do not have wings or sex organs
Complete metamorphosis
young insects do not look like adults but molt and change their form as they mature
pupa
larvae pass through several molts, getting bigger each time, until they molt into an inactive form
Insecticide
a chemical compound that kills insects and other arthropods
Vector
an organism that carries a disease from one host to another
