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Phylum Porifera

Phylum Porifera. A.K.A. Sponges. Sponges are an animal??. Yes, they are!!! Sessile - sponges do not move; anchored to one place (rock or shell) Sponges have no specialized tissues, organs, or symmetry Basically a sponge is a bunch of cells grouped together

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Phylum Porifera

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  1. Phylum Porifera A.K.A. Sponges

  2. Sponges are an animal?? • Yes, they are!!! • Sessile- sponges do not move; anchored to one place (rock or shell) • Sponges have no specialized tissues, organs, or symmetry • Basically a sponge is a bunch of cells grouped together • Live in shallow seas & some in fresh water

  3. General Characteristics • Asymmetric (no true symmetry) • Wide variety of colors • Shapes- look like balls, discs, vases, branching shrubs, or small trees • “pore-bearing”- look like a sack full of holes

  4. Skeletal system • Spongin- flexible protein • Spicules- spikes/needles of calcium carbonate Provide support Spongin Spicules

  5. Digestion • Filter feeder (heterotroph)- bring in small food particles from water through porocytes (pores) & travels through spongocoel (central cavity) • Then the choanocytes trap & digest food; • Next, amoebocytes carry nutrients to cells & take away waste; • Finally, the remaining water leaves through the osculum (opening at top of sponge)

  6. Hey, nice choanocyte you got there!

  7. Nervous and Circulatory System • Sponges don’t have them!!

  8. Respiration • Diffusion- oxygen from water moves into sponge cells (high to low)

  9. Reproduction • Asexual- budding -small piece of sponge breaks off from parent & develops into a full grown sponge • Sexual- hermaphrodites (produce eggs & sperm at different times); • sperm cells made by one sponge are carried to another sponge by water & once inside the sperm fertilizes the egg; • egg develops into a larvae & attaches itself to an object in the water where it develops into an adult

  10. Excretion • Waste is collected by the amoebocytes through diffusion & it leaves through the osculum

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