Parazoa-Radiata - Parazoa, Radiata A. Phylum: Porifera-...

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Parazoa, Radiata A. Phylum: Porifera- sponges 1. Mostly marine 2. Classes- separated by skeletal spicule (spikes) makes up a. Calcispongiae- skeletal spicules made of Calcium Carbonate b. Hexactinellida- skeletal spicules made of silica (glass) c. Demospongia- skeletal spicules made of Spongin (protein) 3. Body Plan a. sac- pores (holes), spongocoel (inner cavity), osculum (frontal orifice) b. epidermal cells- outer most layer c. collar cell (choanocytes)- flagellated inner cells d. mesohyl- gelatin-like material e. skeletal spicules- located in mesohyl, for support f. amoebocyte- amoeba-like cell, can move inside mesohyl, these cells secrete skeletal spicule. g. no tissue h. no organs i. no systems 4. Lifestyle
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a. sessile- stationary b. filter-feeder c. embryos can move 5. Reproduction a. asexual - fragmentation - budding b. sexual - monoecious (Hermaphroditic)- produce sperm and eggs 6. Digestion a. intracellular digestion - choanocytes are phagocytic, they start digestion and pass it to
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This note was uploaded on 04/07/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.

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Parazoa-Radiata - Parazoa, Radiata A. Phylum: Porifera-...

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