Cestoda (Tapeworms)

Monogenea (Parasitic flatworms)

Trematoda (Flukes)

Turbellaria (Free-living flatworms)

Chaetognatha (Arrow worms)

Chordata (Chordates: animals having a notochord, vertebrates)

Echinodermata (Echinoderms: starfish, sea urchins, sea cucumbers)

Hemichordata (Hemichordates: sawblades and acorn worms)

Xenoturbellida (Delicate, ciliated marine worms that feed on molluscs)

Annelida/Echiura/Pogonophora group (Segmented worms, marine worms)

Brachiopoda (Lamp shells: shelled sedentary marine animals)

Bryozoa (Bryozoans: lace corals, colonial marine 'moss animals')

Entoprocta (Entoprocts, goblet worms)

Mollusca (Mollusks: shellfish, squid, octopus, snails)

Myzostomida (Small parasitic worms of echinoderms)

Nemertea (Ribbon worms)

Panarthropoda (Arthropods: insects, spider, lobster, crabs)

Priapulida (Predatory marine mud worms)

Sipuncula (Sipunculids: peanut worms)

Archiacanthocephala (Spiny-headed endoparasitic worms)

Eoacanthocephala (Parasitic worms of fish and turtles)

Palaeacanthocephala (Intestinal parasitic worms)

Polyacanthocephala (Endoparasitic worms)

Symbion (Live on mouthparts of lobster)

Chaetonotida (Small aquatic worms)

Macrodasyida (Microscopic aquatic worms)

Homalorhagida (Kinorhynchs, free-living marine animals 1 mm or smaller)

Limnognathia (Microscopic invertebrate with 32 moving jaw parts)

Chromadorea (Ssecernentea)

Enoplea (Adenophorea)

Gordioida (Gordian worms)

Nectonematoida (Horsehair worms)

Bdelloidea (Moss rotifers, haven't reproduced sexually in 40 million years)

Monogononta (Sexually reproducing, make up 90% of the rotifers)

Seisonidea (Marine bisexual rotifers that live on crustaceans)

Gnathostomulida (Jaw worms)

Alcyonacea (Soft corals)

Funiculinidae (Deep water sea pens)

Gorgonacea (Sea fans, sea whips, gorgonians)

Helioporacea (Blue corals)

Pennatulacea (Sea pens, sea feathers, sea pansies)

Telestacea (Branched pipe corals)

Antipatharia (Black corals)

Ceriantharia (Tube-dwelling anemones)

Dendrobrachiidae (Black coral)

Actiniaria (Sea anemones)

Corallimorpharia (Coral-like anemones)

Ptychodactiaria (Cold water anemones)

Scleractinia (Stony corals)

Zoanthidea (Colonial anemones)

Carybdeidae (Box jellyfish)

Chirodropidae (Sea wasps)

Anthomedusae (Flower medusa)

Leptomedusae (Thecate hydroids)

Limnomedusae (Freshwater jellyfish)

Calycophorae (Calycophores: numerous, preditory, lack pneumatophore)

Cystonectae (Portuguese Man-O-War)

Physonectae (Deep-water siphonophora)

Cassiopeidae (Upsidedown jellyfishes)

Catostylidae (Blue jellyfishes)

Rhizostomatidae (Rhizostomid medusse)

Cyaneidae (Sea-mane jellyfish)

Pelagiidae (Sea nettle)

Ulmaridae (Moon jellyfish)