Invertebrates: Table

Cnidaria

9000

mainly marine

sea anemone, hydra, coral, jellyfish

Ctenophora

50

marine plankton

comb jelly, sea gooseberry

Platyhelinthes

12 700

mainly parasitic

flatworm, fluke, tapeworm

Nemertea

600

mainly marine

ribbon worm

Acanthocephala

500

parasitic

spiny-headed worm

Rotifera

1800

marine and fresh water

wheel animal

Nematoda

10 000

all, many parasitic

round worm

Brachiopoda

280

marine, benthos & intertidal

lampshell

Bryozoa

4000

aquatic

moss animal

Pogonophora

80

deep-sea benthos

beard worm

Mollusca

100 000

all

clam, snail, octopus, squid

Annelida

8700

aquatic or damp soil

earthworm, leech, tube worm

Arthropoda

923 000

all

insect, spider, crustacean

Chaetognatha

50

marine plankton

arrow worm

Echinodermata

6000

marine, benthos & intertidal

starfish

Protochordates

marine

sea squirt