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Functional Homologies and Phyla
The Main Kinds of Cnidaria
7 other sections not shown
adult anemone annelid Anthozoa anus archetypic asexual bivalves blood vessels body wall budding canal cells cephalopods chitons choanocytes cilia circular muscles cnidarians coelenterates coelom colony complex contraction corals ctenidia ctenidium ctenophores digestive dorsal ducts ecological ectoderm eggs elongate endoderm epidermis exhalant feeding female fertilized fibers Figure filaments flatworms free-living freshwater functional gastropods gastrovascular cavity genera genital gill glands gonads gonophores gymnoblastic hermaphroditic homologies host hydroid Hydrozoa individuals intestine invertebrates involves jellyfish larva layers life-cycle living locomotion longitudinal muscles mantle mantle-cavity many-celled animals medusae mesenteries mesoderm metameric metameric segmentation molluscan molluscs mouth nematocysts nematodes nemertines Neopilina nerve nervous system organs pair pallial parasitic pattern phyla phylum physiology planula polyp posterior pseudocoelomate relatively reproduction Scyphozoa sea-anemones secreted sense-organs sexual shell skeleton snails species sperms spicules sponges stage stomodaeum structures Subclass sucker surface tapeworm tentacles tissues Turbellaria typical usually ventral vertebrate visceral mass water current worms