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Sponges&Cnidarians 08

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  • 1. Sponges, Cnidarians & Ctenophores
  • 2.  
  • 3.  
  • 4.  
  • 5.  
  • 6. This is a “loofah sponge”… … which is most certainly NOT A SPONGE!
  • 7. A “loofah” is a type of gourd.
  • 8.  
  • 9. PORIFERA=>
    • “ sponges”
    • 1st multicellular life?
    • over 10000 known species
    • sessile/asymmetry
    • teacup-sized sponge can filter 5000L of water in a day !
  • 10. PORIFERA=>
    • 3 types of “skeleton”:
      • spongin (flexible protein)
  • 11. spongin fibers
  • 12. PORIFERA=>
    • 3 types of “skeleton”:
      • spongin (flexible protein)
      • CaCO 3 - shallow marine “spicules”
  • 13.  
  • 14. PORIFERA=>
    • 3 types of “skeleton”:
      • spongin (flexible protein)
      • CaCO 3 - shallow marine
      • SiO 2 - deep marine
    • some have all three
    • ANATOMY & REPRODUCTION:
  • 15.  
  • 16.  
  • 17.  
  • 18. sponge larva
  • 19. gemmule
  • 20.  
  • 21.  
  • 22.  
  • 23.  
  • 24. encrusting sponge
  • 25. encrusting sponge
  • 26.  
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  • 37.  
  • 38.  
  • 39.  
  • 40.  
  • 41. The CNIDARIANS
  • 42.  
  • 43. CNIDARIA=>
    • More than 9000 species
    • Includes sea anemones, jellyfish, corals, hydras,
    • More highly organized than sponges, but still very simple animals
  • 44. CNIDARIA=>
    • Amazing predators for their simplicity
    • hollow chamber called the: GASTROVASCULAR CAVITY -digestion & food distribution
    • nervous system is called a: “nerve net”
  • 45. CNIDARIA=>
    • have RADIAL SYMMETRY
    • all have CNIDOCYTES: “stinging cells”
    • 3 major functional types:
  • 46. especially common type
  • 47.  
  • 48.  
  • 49.  
  • 50.  
  • 51.  
  • 52.  
  • 53.  
  • 54.  
  • 55.  
  • 56. CNIDARIA=>
    • have TWO main “body plans”:
      • the POLYP and MEDUSA
    • POLYP is sessile and asexual
    • MEDUSA is sexual and free-swimming
  • 57.  
  • 58.  
  • 59.  
  • 60.  
  • 61.  
  • 62.
    • Describe two possible benefits to an algae that resides inside a cnidarian.
    • Describe two possible benefits to an animal which has algae living within its tissue...
  • 63. Hydrozoa Scyphozoa Anthozoa Cubozoa
  • 64. HYDROZOA=>
    • includes over 3,700 species
    • polyp phase dominant
    • Most members are colonial
      • Different polyps have different functions
    • includes Hydra, Obelia and the Portuguese man O’ war
  • 65.  
  • 66.  
  • 67.  
  • 68.  
  • 69. branching hydroid
  • 70.  
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  • 75.  
  • 76.  
  • 77.  
  • 78. SCYPHOZOA=>
    • translates to “cup animals”
    • medusa is dominant
    • The “jellyfish” - more than 200 sp.
    • Most are found floating in the open sea
  • 79.  
  • 80.  
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  • 84.  
  • 85.  
  • 86. West coast Sea nettle
  • 87.  
  • 88.  
  • 89. ANTHOZOA=>
    • translates as: “flower animals”
    • never a medusoid stage
    • includes sea anemones, soft corals, and true “stony” corals
  • 90.  
  • 91.  
  • 92.  
  • 93.  
  • 94.  
  • 95.  
  • 96.  
  • 97. zooxanthellae
  • 98. CaCO 3 skeletons
  • 99.  
  • 100.  
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  • 102.  
  • 103.  
  • 104.  
  • 105.  
  • 106. CUBOZOA=>
    • the “box jellies”
    • have a square shape when viewed from above
    • possess four evenly-spaced tentacles (or groups of tentacles)
    • found mostly in tropical oceans
    • have a primitive version of an “eye”
    • ~ 20 species
  • 107.  
  • 108. The Sea Wasp: Chironex Fleckeri
  • 109. CTENOPHORA=>
    • translates as: “comb holder”
    • the “comb jellies”
    • no stinging cells –have colloblasts instead (sticky)
    • move via cilia
  • 110.  
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  • 117.