Sponges

    Calcarea

    Demospongiae

Cnidarians

    Hydrozoans

    Jellyfish

    Soft corals

    Sea fans

    Sea pens

    Stony corals

    Tube anemones

    Anemones

Comb jellies

Flatworms

Ribbon worms

Segmented worms

    Bristle worms

    Leeches

Spoon worms

Arthropods

    Sea spiders

    Crustaceans

Mollusks

    Chitons

    Sea snails

    Sea slugs

    Mussels & scallops

    Cuttlefish & octopuses

Lampshells

Moss animals

Echinoderms

    Feather stars

    Sea stars

    Brittle stars

    Sea urchins

    Sea cucumbers

Chordates

    Sea squirts

    Agnathans

    Cartilaginous fish

    Ray-finned fish