arthropods n echinoderms

appendages

appendages

a structure that extends from an arthropod’s body wall; have joints that bend

arachnids

one of four major types of arthropods and the largest class of subphylum chelicerae, these posess mouthparts called chelicaerae and have four pairs of walking legs

arthropod

the most diverse of multicellular organisms, they have segmented bodies and jointed appendages, are supported by tough exoskeletons amde of chitin that shed for growth and are coelomates with bilateral symmetry

book lungs

organs that have respiratory tissue stacked like pages of a book

carapace

hard upper shell of a turtle, arachnid or crustecean that covers the cephalothorax

cephalothorax

body region where head is fused with the thorax

chelicerae

mouthparts of arachnids that modified into pincers or fangs

chelipeds

large pincers in crayfish and lobster

chitin

protein found in exoskeleton

crustaceans

2-3 body sections, 2 pair antennae, and chewing mouth parts called a mandible (except barnacles), includes lobster, pill bugs, crabs

echinoderms

marine animals that have spiny skin surrounding an endoskeleton. they also have a water vascular system and pentamerous radial symmetry

exoskeleton

often called a shell in arthropods, its thin and flexible and is where the joints of appendages are located. protective and provides structural support

gills

filamentous organ that’s specialized for gas exchange

incomplete metamorphosis

egg hatches into a nymph, which looks like a smaller version of an adult, then molts a few times

complete metamorphosis

larva looks drastically different from adult (egg, larva, pupa, adult)

malpighian tubules

slender, fingerlike extensions from the arthropod’s gut bathed in blood that have water and small particles move through them and into the gut

mandible

chewing mouth parts, jaws

molting

ecdysis, the process of shedding and discarding exoskeletons periodically for growth

nerve ring

nerve cells around the mouth in echindoerms that basically act as the brain

omnivore

eats both plants and animals

pedipalps

second pair of appendages in arachnids that specialize in catching and handling prey

pheromones

chemical substances used for communication, such as among social insects

spiracles

structure in arthropod body where air enters

tracheal tubes

a network of fine tubes used for respiring in a majority of terrestrial arthropods

tube foot

suction-like cup structures in echinoderms

water vascular system

system filled w fluid that carries out essential body functions like respiration, digestion, circulation, and movment