Spongesjellyfish

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Spongesjellyfish

  1. 1. Phylum Porifera & Cnidaria
  2. 2. Sponges <ul><li>Belong to phylum Porifera </li></ul><ul><li>Sessile </li></ul><ul><li>Around 10,000 species </li></ul><ul><li>Less specialized than other animals </li></ul><ul><li>No true tissues or organs </li></ul><ul><li>Grow in many shapes, sizes, & colors </li></ul><ul><li>Can be as small as 1 cm or as large as 2 m </li></ul>
  3. 3. Body Plan <ul><li>Tube-like & asymmetrical </li></ul><ul><li>Osculum: </li></ul><ul><li>Opening at top of sponge. Water leaves through it </li></ul><ul><li>Collar cells: </li></ul><ul><li>Also called “choanocytes” </li></ul><ul><li>Innermost lining of sponge </li></ul><ul><li>Lined with flagella, draws water in and circulates it </li></ul><ul><li>Spongin & spicules: </li></ul><ul><li>Make up skeletons of sponges </li></ul><ul><li>Helps to support body of sponge under water pressure </li></ul>
  4. 5. Feeding & Digestion <ul><li>Filter feeders </li></ul><ul><li>Food includes: bacteria, protozoans, algae, etc </li></ul><ul><li>Food is digested by collar cells </li></ul><ul><li>Nutrients pass to amoebocytes…. </li></ul><ul><li>Amoebocytes: </li></ul><ul><li>Cells that crawl/migrate to different parts of the sponge and deliver food </li></ul>
  5. 6. Reproduction <ul><li>Reproduce asexually by budding </li></ul><ul><li>Can regenerate broken body parts </li></ul><ul><li>Reproduce sexually also </li></ul><ul><li>Sperm released from one sponge enter pores of another </li></ul><ul><li>Collar cells….amoebocytes…..eggs….fertilization </li></ul><ul><li>Forms a larva </li></ul><ul><li>Some sponges are separate sexes </li></ul><ul><li>Most hermaphroditic </li></ul><ul><li>Reproductive success!! Why?? </li></ul>
  6. 7. Phylum Cnidaria <ul><li>Bodies constructed of two cell layers: </li></ul><ul><li>Epidermis, gastrodermis </li></ul><ul><li>Gut = “gastrovascular cavity” </li></ul><ul><li>Two body types: </li></ul><ul><li>Polyp (sessile) </li></ul><ul><li>Medusa (motile) </li></ul>
  7. 11. Feeding & Defense <ul><li>Cnidocytes = stinging cells </li></ul><ul><li>Nematocyst = stinging structure </li></ul><ul><li>Uses a trigger mechanism </li></ul><ul><li>Poison from stingers paralyzes prey </li></ul>
  8. 13. Classes <ul><li>Class Hydrozoa: </li></ul><ul><li>Portugese Man o’ War </li></ul><ul><li>Hydras (exist only as polyps). Fresh, salt water </li></ul><ul><li>Class Scyphozoa: </li></ul><ul><li>Jellyfish </li></ul><ul><li>Class Anthozoa: (flower-like) </li></ul><ul><li>Coral reefs </li></ul>
  9. 16. Jellyfish Lifecycle <ul><li>Medusas release gametes </li></ul><ul><li>Gametes form zygote </li></ul><ul><li>Zygote morphs into a planula larva </li></ul><ul><li>Planula attaches to ocean floor </li></ul><ul><li>Matures into a polyp </li></ul><ul><li>Polyp buds out, making young medusas </li></ul><ul><li>Young medusas mature, and cycle starts again </li></ul>

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