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Phylum Cnidaria

Phylum Cnidaria. General Characteristics : Cnidarian means “stinging creature.” Radial symmetry Two different body plans exist: medusa and polyp Cnidarians are made up of two tissue layers separated by mesoglea . Habitat : aquatic. Phylum Cnidaria.

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Phylum Cnidaria

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  1. Phylum Cnidaria • General Characteristics: • Cnidarian means “stinging creature.” • Radial symmetry • Two different body plans exist: • medusa and polyp • Cnidarians are made up of two tissue layers separated by mesoglea. • Habitat: aquatic

  2. Phylum Cnidaria • Nutrition: Capture pray using cnidocytes (stinging cells). • Sting prey and paralyze it so that it can be pulled into the mouth to be digested. • Some organisms become immune to the sting and form mutualistic relationships with cnidarians.

  3. Phylum Cnidaria • Digestion: takes place in the gastrovascular cavity, a digestive chamber with one opening, food enters here. • Break down occurs in the cavity and then partially digested food is absorbed by the gastroderm and digestion is finished intracelluarly.

  4. Phylum Cnidaria • Circulation: takes place through diffusion in the gastrovascular cavity • Respiration: Diffusion of oxygen and carbon dioxide takes place in the gastrovascular cavity. • Excretion: diffusion through the body wall or exits out through the mouth of the organism.

  5. Phylum Cnidaria • Nervous: • Touch sensitive stinging cells called nematocysts • a nerve net, but no brain • statocysts used to detect gravity • ocelli to detect light (eyespots)

  6. Phylum Cnidaria • Reproduction: • Sexual reproduction occurs through external fertilization when the sperm is united with an egg outside of the body

  7. Phylum Cnidaria • Reproduction: • Asexual reproduction can occur through budding and fission.

  8. Phylum Cnidaria • Examples: sea anemones and coral have a dominant polyp stage, hydra alternate between forms, jellyfish and sea wasps (box jelly) with a dominant medusa form

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