The 11 phyla of the Kingdom Animalia are: 1. Porifera (Sponges) 2. Cnidaria (Jellyfish, coral, and sea anemones) 3. Platyhelminthes (Flatworms) 4. Nematoda (Roundworms) 5. Mollusca (Snails, clams, and squids) 6. Annelida (Segmented worms) 7. Arthropoda (Insects, spiders, crustaceans, and millipedes) 8. Echinodermata (Sea urchins, starfish, and sea cucumbers) 9. Chordata (Vertebrates and their relatives) 10. Bryozoa (Moss animals) 11. Xenoturbellida (A basal deuterostome phylum) These 11 phyla represent the diversity of form and function within the Kingdom Animalia, from the simplest and most primitive forms, such as sponges, to the highly complex and specialized forms, such as vertebrates. Each phylum has unique characteristics and adaptations that allow its members to thrive in their environments and to perform specific functions in the ecosystem.