1
excretory organs of a crayfish
green glands
jelly fish, sea anemones, and hydras
coelenterates
invertebrates characterized by a muscular foot, visceral hump, and a mantle
mollusks
diseases caused by protozoa
largest invertebrate
giant squid
clams, snails, octopuses, and nautiluses are classified as
mollusks
clams, oysters, and scallops
bivalves
microscopic multicellular invertebrates named for the rotating appearance of cilia
outer skinlike covering of a mollusk that secretes the shell
mantle
colorful, sluglike marine gastropod with exposed gills
nudibranch
the only animals with a water-vascular system
echinoderms
octopuses, squid, and nautiluses
cephalopods
earthworms, sea worms, leeches
segmented worms (annelids)
precious stone formed by an oyster
pearl
only cephalopod with an external shell
nautilus
snails, slugs, conchs, nudebranches
gastropods
free-swimming, umbrella-shaped form of a coelenterate
medusa
planarians, flukes, tapeworms
flatworms
scraping organ in the mouth of a snail
radula
protozoan that possesses a flagellum, chloroplasts, and an eyespot
euglena
starfish, sea urchin, and sand dollar are characterized by spiny skin and rad0ial symmetry are
echinoderms
sessile animals characterized by spicules, incurrent pores, an osculum, and no nervous system
sponges
euglenas, amoebas and paramecia
protozoa
coelenterates that live together in colonies and form reefs
corals
ciliated protozoan that appears slipper-shaped under a microscope
paramecium