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  • INVERTEBRATE NERVOUS SYSTEMS

    A simple cnidarian An echinoderm (starfish). Not really (= coelenterate), Hydra radially symmetrical.

    Starfish larvae are bilaterally symmetrical.

    Image from

  • PLATYHELMINTHS - flatworms.

    ARTHROPODS and MOLLUSCS.

  • APLYSIA (a sea-slug).

  • Dorsal and ventral nerve cords.

  • The phylum Chordata also includes all the vertebrates.

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