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Bio2 Phylum Porifera - Phylum Porifera The sponges Monday...

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Phylum Porifera The sponges Monday, June 13, 2011
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Porifera overview -generally asymmetrical with sac-like bodies -more than 100 described fossils, earlies at 550 mill yrs old -most ancient are glass sponges; formed reefs up to 7000 kilos long (Great Barrier Reef is 2000 kilos long); desappeared 140 mya -1991 glass sponge reefs discovered -best example without normal tissues Evolution &characteristics -no cells or tissues (collection of cell without a basal lamina); epidermal cells on outer surface, collar cells in inner cavity -evolved from colonial protozoa (Choanoflagellate) -unlike animals with tissues, they can reorganize themselves if shredded 320 tissues and 6 trillion cells in humans Monday, June 13, 2011
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Basic Architecture Monday, June 13, 2011
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Grade of body Monday, June 13, 2011
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3 body types Asconoid (simplest) • Syconoid – larger; result of surface area volume constraints of asconoid form; inc SA for filtering by folding asconoid surface; flagellated canals Leuconoid (most complex) – flagellated chambers Monday, June 13, 2011
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