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Cnidarians. Jellies, Anemones, Corals Dimorphism: Two body shapes during life cycle. (Polyp & Medusa) Gastrovascular cavity Primitive nerve net Two distinct tissue layers: Epidermis & Gastrodermis Cnidocyte (Stinging cells) Radial Symmetry. Life cycle. Reproduction :
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Cnidarians • Jellies, Anemones, Corals • Dimorphism: Two body shapes during life cycle. (Polyp & Medusa) • Gastrovascular cavity • Primitive nerve net • Two distinct tissue layers: Epidermis & Gastrodermis • Cnidocyte (Stinging cells) • Radial Symmetry
Life cycle • Reproduction : • Most cnidarians reproduce both sexually and asexually.
Classes of Cnidaria • Scyphozoa (Cup Animals) • Hydrozoa (Serpent Animals) • Anthozoa (Flower Animals)
Scyphozoa • Scyphozoa • True jellies • Medusa form during most of its life cycle. • Lions Mane is the most common in L.I.S. • Butter fish lives in its tentacles.
Sea Wasp • Known as box jellyfish • Most powerful venom in the world • Lives in Australia • Can be up to 60 meters in length
Hydrozoa • Both body plans: polyp and medusa • Reproduce sexually as medusas. • Example: Portuguese Man Of War
Anthozoa • They are individual or colonies of polyps found in coastal waters. • No swimming medusa stage. • Examples: Sea anemones,Hard corals, sea fans
Phylum: Ctenophora • Ctenophores • Common name: Comb jellies • Contain eight rows of comb plates made of cilia used for locomotion. • Bioluminescent • No stinging cells • They feed on plankton