Invertebrates

Front 1

arthropod

Back 1

invertebrate with jointed legs and a hard exoskeleton

Front 2

coelenterate

Back 2

invertebrate with stinging tentacles

Front 3

echinoderm

Back 3

invertebrate with spiny skin

Front 4

invertebrate

Back 4

animal with no notochord or backbone

Front 5

mollusk

Back 5

invertebrate with a soft body and usually a shell

Front 6

sponge

Back 6

invertebrate that has a body filled with holes and that cannot move about on its own

Front 7

worm

Back 7

invertebrate with a long, narrow body; may be flat, round, or segmented

Front 8

collar cells

Back 8

cells in a sponge that trap tiny plants and animals for food

Front 9

flagellum

Back 9

long, threadlike structure

Front 10

budding

Back 10

method of reproduction in which a small organism grows on the larger organism, then breaks away

Front 11

medusa

Back 11

jellyfish

Front 12

polyp

Back 12

small coelenterate with its closed end attached to a rock

Front 13

radial symmetry

Back 13

arrangement of parts in a circle around a center point

Front 14

reef

Back 14

large structure made of the skeletons of corals

Front 15

tentacle

Back 15

long, armlike structure on a coelenterate

Front 16

flatworm

Back 16

worm with a flat body; most simple worm

Front 17

parasite

Back 17

organism that lives on and benefits from another animal withou benefiting that animal in any way

Front 18

roundworm

Back 18

worm with a long, thin, round body

Front 19

segmented worm

Back 19

worm with a segmented body; the most complex worm

Front 20

bivalve

Back 20

mollusk that has a shell with two hinged halves

Front 21

cephalopod

Back 21

mollusk with a large head and a foot divided into tentacles

Front 22

gastropod

Back 22

mollusk with a single shell and one or two sets of tentacles

Front 23

mantle

Back 23

stucture in mollusks that covers the body and often makes a shell

Front 24

radula

Back 24

ribbonlike tongue with many small, sharp teeth

Front 25

siphons

Back 25

long tubes in bivalves that take in food and water and get rid of waste

Front 26

tube feet

Back 26

tiny tubelike structures in echinoderms that help them move, gather food, feel, and breathe

Front 27

arachnid

Back 27

arthropod with no wings, four pairs of legs, no antennae, and two body parts

Front 28

bilateral symmetry

Back 28

arrangement of body parts so left and right sides are mirror images

Front 29

chitin

Back 29

hard material that makes up the exoskeleton of arthropods

Front 30

crustacean

Back 30

arthropod with more than three pairs of legs and most often two pairs of antennae