Easily enter Matching - Match the phylum with its advancement: A) Platyhelminthes (Flatworms) B) Annelida (Segmented worms) D) Nematoda (Roundworms) E) Molluska AC) Arthropoda AD) Porifera C) Echinodermata AB) Cnidaria 25. First and most simple animal - "Pore bearing" (sponges) 26. Radial symmetry and gastrovascular cavity ("stinging cells"); Jellyfish, Man-of-war, Coral, Hydra 27. Bilateral symmetry, organ systems, and cephalization; Planaria, Tapeworms, and Flukes 28. 2-opening digestive system and dioecious; Hookworms, Trichina, Ascaris, Heartworms 29. Segmented bodies; Includes earthworms and leeches 30. Meaning "soft body" this group is the first with a true coelom (body cavity); Clams, Octopus, Snails 31. Jointed appendages and exoskeleton; Spiders, Insects, Crustaceans 32. Most closely related to vertebrates; radial symmetry; Starfish, Sea Cucumbers, Sea Urchins​