Porifera Structural Characteristics Cnidaria Sketch Structural Characteristics Bilaterally Symmetrical Worms Sketch Structural Characteristics Sketch Reproduction Reproduction Phylum: Platyhelminthes (Flatworms) Feeding Feeding Phylum: Nemertea (Ribon Worms) Class: Hydrozoa Ctenophora (Comb Jellies) Phylum: Nematoda (Roundworms) Structural Characteristics Class: Scyphozoa Phylum: Annelida (Segmented Worms) Feeding Class: Cubozoa Class: Anthozoans Mollusca Arthropoda Echinodermata Structural Characteristics Structural Characteristics Structural Characteristics Feeding and Digestion Feeding and Digestion Feeding and Digestion Nervous System and Behavior Nervous System and Behavior Nervous System and Behavior Reproduction and Life Histroy Reproduction and Life History Reproduction and Life History Class: Gastropoda Crustaceans Class: Asteroidea (Sea Stars) Copepods Class: Bivalvia Class: Ophiuroidea (Brittle Stars) Barnacles Amphipods Class: Echinoidea (Sea Urchins) Class: Cephalopoda Isopods Class: Holothuroidea (Sea Cuccumbers) Decapods Class: Merostomata (Horshoe Crab) Class: Crinoidea (Feather Stars and Sea Lilies) OTHER NOTES OTHER NOTES OTHER NOTES