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Invertebrate Phylum: CNIDARIANS (Coelenterates)

Invertebrate Phylum: CNIDARIANS (Coelenterates). Vocabulary "Cnidarian” = nettle "Coelenterata" = hollow gut polyp = "vase" shaped body form medusa = "bell" shaped body form Cnidocyte = stinging cell. Vocabulary

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Invertebrate Phylum: CNIDARIANS (Coelenterates)

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  1. Invertebrate Phylum: CNIDARIANS (Coelenterates)

  2. Vocabulary • "Cnidarian” = nettle • "Coelenterata" = hollow gut • polyp = "vase" shaped body form • medusa = "bell" shaped body form • Cnidocyte = stinging cell

  3. 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

  4. Types • anemones, jellyfish, hydras, coral, Portuguese-man-o-war

  5. Characteristics * Polyp - sedentary, nonmotile, cylindrical body with mouth and tentacles * Medusa - upside down bowl, mouth and tentacles facing down; modified for swimming

  6. 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

  7. Habitat • Fresh and salt water • Worldwide • Mostly South Pacific and Caribbean

  8. 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)

  9. Mouth Testes Tentacle Gastrovascular Cavity Ovary Bud

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