invertebrate nervous systems invertebrate nervous systems a simple cnidarian an echinoderm...
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INVERTEBRATE NERVOUS SYSTEMS
A simple cnidarian An echinoderm (starfish). Not really (= coelenterate), Hydra radially symmetrical.
Starfish larvae are bilaterally symmetrical.
PLATYHELMINTHS - flatworms.
ARTHROPODS and MOLLUSCS.
APLYSIA (a sea-slug).
Dorsal and ventral nerve cords.
The phylum Chordata also includes all the vertebrates.