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Spongesjellyfish

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Transcript

  • 1. Phylum Porifera & Cnidaria
  • 2. Sponges
    • Belong to phylum Porifera
    • Sessile
    • Around 10,000 species
    • Less specialized than other animals
    • No true tissues or organs
    • Grow in many shapes, sizes, & colors
    • Can be as small as 1 cm or as large as 2 m
  • 3. Body Plan
    • Tube-like & asymmetrical
    • Osculum:
    • Opening at top of sponge. Water leaves through it
    • Collar cells:
    • Also called “choanocytes”
    • Innermost lining of sponge
    • Lined with flagella, draws water in and circulates it
    • Spongin & spicules:
    • Make up skeletons of sponges
    • Helps to support body of sponge under water pressure
  • 4.  
  • 5. Feeding & Digestion
    • Filter feeders
    • Food includes: bacteria, protozoans, algae, etc
    • Food is digested by collar cells
    • Nutrients pass to amoebocytes….
    • Amoebocytes:
    • Cells that crawl/migrate to different parts of the sponge and deliver food
  • 6. Reproduction
    • Reproduce asexually by budding
    • Can regenerate broken body parts
    • Reproduce sexually also
    • Sperm released from one sponge enter pores of another
    • Collar cells….amoebocytes…..eggs….fertilization
    • Forms a larva
    • Some sponges are separate sexes
    • Most hermaphroditic
    • Reproductive success!! Why??
  • 7. Phylum Cnidaria
    • Bodies constructed of two cell layers:
    • Epidermis, gastrodermis
    • Gut = “gastrovascular cavity”
    • Two body types:
    • Polyp (sessile)
    • Medusa (motile)
  • 8.  
  • 9.  
  • 10.  
  • 11. Feeding & Defense
    • Cnidocytes = stinging cells
    • Nematocyst = stinging structure
    • Uses a trigger mechanism
    • Poison from stingers paralyzes prey
  • 12.  
  • 13. Classes
    • Class Hydrozoa:
    • Portugese Man o’ War
    • Hydras (exist only as polyps). Fresh, salt water
    • Class Scyphozoa:
    • Jellyfish
    • Class Anthozoa: (flower-like)
    • Coral reefs
  • 14.  
  • 15.  
  • 16. Jellyfish Lifecycle
    • Medusas release gametes
    • Gametes form zygote
    • Zygote morphs into a planula larva
    • Planula attaches to ocean floor
    • Matures into a polyp
    • Polyp buds out, making young medusas
    • Young medusas mature, and cycle starts again