Biology Notes 4-9-08

Biology Notes 4-9-08 - Biology Notes April 9 2008...

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Biology Notes April 9, 2008 Ectoprocts : Bryozoans or ‘moss animals’ -Colonial; external body wall secretes ‘house’ -feed with lophophore Flat worms, rotifers and ribbon worms form a monophyletic group even though they have different body plans Flatworms : -very flat – large surface area/volume -gas exchange over surface -digestive tract is a mouth opening into a highly branched sac -small free-living flatworms have cephalization and glide over surfaces by broad bands of cilia -most flatworms are internal parasites -tapeworms and flukes, they absorb digested food from digestive tract of host Rotifers : -rotifers are tiny (50-500um) aquatic, but have specialized internal organs -complete gut -body cavity is a pseudocoel hydrostatic skeleton, also move with cilia -corona of cilia for feeding, mastax to grind food 1
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Biology Notes April 9, 2008 Ribbon worms : -nemertean worms -aquatic, complete digestive tract -they have fluid filled cavity called the Rhyncocoel; inside is a hollow, muscular proboscis
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Biology Notes 4-9-08 - Biology Notes April 9 2008...

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