Unseg worms08 - Unsegmented Worms Phylum Platyhelminthes...

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Unsegmented Worms Phylum Platyhelminthes
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Advantage of Being Flat Surface area to volume ratio is important for organisms. many substances enter and leave through body surface. Faster absorption and release of wastes 3mm 3mm 3mm Volume = 3 x 3 x 3 = 27mm 2 Area = 6(3 x 3) = 54mm 3 9mm 3mm 1mm Volume = 9 x 3 x 1 = 27mm 2 Area = 2(9 x 1) + 2(3 x 1) + 2(3x9) = 78mm 3
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I. Unsegmented worms A. = Worms that are not divided into sections externally & internally B. Eg. 1. Phylum Platyhelminthes aka flatworms 2. Phylum Nematoda aka Roundworms
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Phylum Platyhelminthes – the Flatworms The Planarians The Flukes The Tapeworms
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C. What is a coelom? = fluid-filled body cavity between body wall & digestive tract
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Kinds of coelom 1. Acoelomate = no coelom i.e. body cavity is NOT fluid filled
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Kinds of coelom 2. Pseudocoelomate = Fluid filled body cavity BUT No mesentary or peritoneum
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Kinds of coelom 3. Eucoelomate = True coelom w/ mesentary (holds gut in place) & peritoneum (mesodermal lining of body cavity
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The Coelom or Body Cavity Advances
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D. Phylum Platyhelminthes 1. Class : Turbellaria – planarians 2. Class : Trematoda – flukes 3. Class : Cestoda – tapeworms
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D. Phylum Platyhelminthes Also Acoelomate: Phylum Nemertea – ribbon worms Phylum Gnathostomulida- jaw worms
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E. General Info re: Flatworms
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