marine invertebrates

sponge classification

porifera

sponge symmetry

asymmetrical, radial

sponge parts

pores, osculum, spicules, spongin, body wall, choanocytes, pinacocytes, amoebocytes

sponge diet

filter feeders

sponge habitat

coastal waters, deep ocean, freshwater; benthic

benthic organisms

live on, in, near the seafloor rather than swimming in open water

sponge adaptations

sessile, porous, regeneration, toxins, symbiotic relationships

sea anemones, sea jellies, coral classification

cnidaria

cnidaria symmetry

radial

cnidaria parts

polyp, medusa, epidermis, tentacles, cnidocytes, oral surface, gastrovascular cavity

cnidaria diet

carniverous, extracellular digestion, intracellular digestion

cnidaria habitats

all oceans, some freshwater; sea anemones + coral - benthic, most sea jellies - pelagic

pelagic

living or drifting in the open water column, away from the seafloor

comb jelly symmetry

biradial

comb jelly parts

comb rows, oral end, aboral end, tentacles, gastrovascular canal system

comb jelly diet

plankton, larvae

flatworm classification

platyhelminthes

flatworm symmetry

bilateral

flatworm parts

flat body, simple nervous system, eyespots

flatworm diet

small invertebrates, detritus

flatworm habitat

seafloor, coral reefs, tide pools; mostly benthic

ribbon worm classification

nemertea

ribbon worm symmetry

bilateral

ribbon worm parts

proboscis, long elastic body, simple digestive + circulatory system

ribbon worm diet

crustaceans, worms, small invertebrates

ribbon worm habitats

sand, mud, under rocks, shallow marine zones; benthic

roundworms/nematode classification

nematoda

nematode symmetry

bilateral

nematode parts

cylindrical body, tough cuticle, simple nervous + digestive system

nematode diet

bacteria, detritus, some parasitic

nematode habitats

sediments, deep sea, parasitic inside hosts; benthic

segmented worm classification

annelida

segmented worm symmetry

bilateral

segmented worm parts

segmented body, chatae, true digestive + circulatory systems

segmented worm diet

detritus, small organisms, filter-feeding/predatory

segmented worm habitat

sand, mud, reefs, intertidal zones; benthic

mollusk definition

soft-bodied invertebrates, many w/ shells, muscular foot, and mantle

mollusk symmetry

bilateral

gastropada examples

snails, sea slugs, nudibranchs

gastropada parts

muscular foot, radula, shell, tentacles

gastropada diet

algae, plants, detritus, or small animals

gastropada habitat

rocky shores, reefs, tide pools, seagrass beds; benthic

bivalve examples

clams, mussels, oysters, scallops

bivalve parts

two valves, gills, muscular foot, byssal threads

bivalve diet

filter feed plankton, organic particles

bivalve habitat

sand/mud, rocks, estuaries, intertidal zones; benthic

cephalopod examples

octopus, squid, cuttlefish, nautilus

cepholopad parts

arms, tentacles, beak, siphon, chromatophores

cephalopod diet

crustaceans, fish, other invertebrates

cephalopod habitat

rocky reefs, open ocean, seafloor, deep sea; some benthic, some pelagic

arthropod examples

crustaceans, barnacles, horseshoe crabs, sea spiders, insects

arthropod symmetry

bilateral

arthropod parts

exoskeleton, jointed legs, segmented body, gills, compound eyes

arthropod diet

algae, plankton, detritus, other animals

arthropod habitat

tide pools, reefs, ocean floor, open water, shorelines; some benthic, some pelagic

echinodermata examples

stars, urchins, cucumbers, brittle stars, sand dollars

echinodermata parts

water vascular system, tube feet, hard endoskeleton

echinodermata diet

algae, detritus, clams/mussels, plankton

echinodermata habitat

tide pools, deep sea; benthic