Animal Phyla

Porifera

Sponges

Cnidaria

Hydras, jellyfishes, corals, sea anemones

Platyhelminthes

planaria, tapeworms, flukes

Mollusca

bivalves, chitons, snails, slugs, squids, octopuses

Annelida

earthworms, leeches, polychaetas

Nematoda

pinworms, hookworms, heartworms

Arthopoda

horseshoe crabs, spiders, scorpions, crustaceans, insects, millipedes/centipedes

Echinodermata

sea stars, sea urchins, sand dollars

Chordata

fishes, amphibians, reptiles, birds, mammals

Sponges

-Cellular/No true tissues (parazoans)

-No cephalization

-No coelom

-No digestive tract

-No segmentation

-Hollow bodies

-Asymmetric/radially symmetric

-Porous bodies → filter feeders

Cnidarians

-True tissues (eumetazoans)

-2 germ layers

-Radial symmetry

-No cephalization

-No coelom

-Incomplete digestive tract

-No segmentation

-Cnidocytes: stinging cells

Flatworms

-True tissues (eumetazoan)

-Protostomes (“mouth 1st”)

-Has organ system

-Bilateral symmetry

-Cephalization

-No coelom

-Incomplete digestive tract (when present)

-No segmentation

-Flat body

Mollusks

-True tissues (eumetazoan)

-Protostomes (“mouth 1st”)

-Has organ system

-Bilateral symmetry

-Usually has cephalization

-Coelom present

-Complete digestive tract

-No segmentation

-Mantle, shell, foot, visceral mass, radula

Annelids

-True tissues (eumetazoan)

-Protostomes (“mouth 1st”)

-Has organ systems

-Bilateral symmetry

-Cephalization present

-Coelom present

-Complete digestive tract

-Segmentation present

Nematodes (Roundworms)

-True tissues (eumetazoan)

-Protostomes (“mouth 1st”)

-Has organ systems

-Bilateral symmetry

-Cephalization present

-Pseudocoelom

-Complete digestive tract

-No segmentation

-Molting

Arthropods

-True tissues (eumetazoan)

-Protostomes (“mouth 1st”)

-Has organ systems

-Bilateral symmetry

-Cephalization present

-Coelom present

-Complete digestive tract

-Segmentation present

-Jointed appendages, exoskeleton, molting

Echinoderms

-True tissues (eumetazoan)

-Deuterostomes (“anus 1st”)

-Has organ systems

-Radial symmetry (adult), bilaterally symmetrical larvae

-No cephalization

-Coelom present

-Complete digestive tract

-No segmentation

-Regeneration; some have 5-part radial symmetry (pentamerism)

Chordata

-True tissues (eumetazoan)

-Deuterostomes (“anus 1st”)

-Has organ systems

-Bilateral symmetry

-Cephalization present

-Coelom present

-Complete digestive tract

-Segmentation present

-Notochord, dorsal, hollow nerve cord; pharyngeal pouches/slits; postanal tail