Here is the list of animal groups that will be treated in the section Invertebrates.

• ARACHNIDS, CENTIPEDES AND MILLIPEDES
• INSECTS AND RELATIVES
• POLYPS AND RELATIVES
• CRUSTACEANS AND HORSESHOE CRABS
• MOLLUSKS, LEECHES AND WORMS
• ECHINODERMS, SPONGES AND HYDROZOAS

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