Bio2 Phylum Porifera

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

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Unformatted text preview: Phylum Porifera The sponges Monday, June 13, 2011 Monday, June 13, 2011 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 Monday, June 13, 2011 Monday, June 13, 2011 Monday, June 13, 2011 Monday, June 13, 2011 Monday, June 13, 2011 Monday, June 13, 2011 Monday, June 13, 2011 Monday, June 13, 2011 Monday, June 13, 2011 Basic Architecture Monday, June 13, 2011 Grade of body Monday, June 13, 2011 3 body types Asconoid (simplest) Syconoid larger; result of surface area volume constraints of asconoid form; inc SA for filtering by...
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Bio2 Phylum Porifera - Phylum Porifera The sponges Monday,...

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