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Phylum Porifera
Sponges
all aquatic, water enter through pores
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Phylum Cnidaria
Corals, Sea jellies, sea anenomes
Stinging cells, all aquatic
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Phylum Platyhelminthes
Tapeworms, flukes, and flat worms
Flat unsegmented worms, some are parasitic
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Phylum Annelida
Earthworms, leeches, marine worms
Segmented worms
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Phylum Mollusca
Clams, snails, limpets, octopus, slugs
Muscular
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Phylum Nematoda
Causes elephantits
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Phylum Arthropoda
Scorpions, spiders, crabs, lobsters, insects
Most diverse group, exoskeleton with chitin, jointed appendages
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Phylum Enchinodermata
Sea stars, sea urchins, sand dollars, sea cucumbers, brittle stars
Endoskeleton covered with tiny spines, water vascular system for most functions, all aquatic
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Phylum Chordata
Sea squirts, tunicates, verebrates
post anal tail, pharyngeal gill slits
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