LabInfo - Phylum Por ifer a o Sponges most ancient phylum o...

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Unformatted text preview: Phylum Por ifer a o Sponges- most ancient phylum o Asymmetrical (no symmetry) o cells (no true tissues): o 1 . Collar cells = similar to free-living protists (w/o stalk) = choanoflagellates (collared flagellates) o Line internal cavity = spongocoel o Beating of flagella --> causes water to flow in/bring food = filter feeders o Some symbionts - perform photosynthesis o Cells Absorb food o 2 . Amoeboid cells = nutrient distributing cells o Ability to de-differentiate --> re-differentiate as other cells o Answers why no true tissues (no discrete organs/structures either) o Characteristics: o Spongocoel = internal cavity, digestion does not occur here o Osculum = excurrent canal for water to exit (after filtered through porocytes (pore cells) o Spongin = proteinaceous material (made by some) -- > structural support o Spicules = needle-like, made of calcium carbonate/silica --> structural support & defense Phylum Por ifer a o 4 classes: o 1 . Class scyphozoa (jellies) o 2 . Class Hydrozoa (hydras)...
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This note was uploaded on 04/29/2010 for the course MBIO 4406 taught by Professor Jeter during the Fall '09 term at Texas Tech.

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LabInfo - Phylum Por ifer a o Sponges most ancient phylum o...

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