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Invertebrate Phylum: CNIDARIANS (Coelenterates) Vocabulary "Cnidarian” = nettle "Coelenterata" = hollow gut polyp = "vase" shaped body form medusa = "bell" shaped body form Cnidocyte = stinging cell Vocabulary nematocysts = capsule with coiled, threadlike tube; inside cnidocytes endoderm= inner layer of skin ectoderm= outer layer of skin mesoglea= jelly-like layer between ectoderm and endoderm Types anemones, jellyfish, hydras, coral, Portuguese-man-o-war Characteristics * Polyp - sedentary, nonmotile, cylindrical body with mouth and tentacles * Medusa - upside down bowl, mouth and tentacles facing down; modified for swimming Characteristics * Food digestion - Paralyze prey with cnidocytes - Tentacles push food to mouth - Cells in gastrovascular cavity release enzymes over prey - Waste ejected through mouth "Nerve Net" = simple nervous system around mouth Habitat Fresh and salt water Worldwide Mostly South Pacific and Caribbean Reproduction Asexual Buds grow tentacles and separate (warm) Sexual Eggs and sperm made in testes and ovaries Sperm fertilize egg; zygote with protective cover shed in spring (fall, cool)
