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Phylum Platyhelmithes

Ken Knezick. Phylum Platyhelmithes. The flatworms. Flatworms have an incomplete gut! Pharynx : Single opening in their digestive system Flatworms also have a excretory system

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Phylum Platyhelmithes

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  1. Ken Knezick Phylum Platyhelmithes The flatworms

  2. Flatworms have an incomplete gut! • Pharynx: Single opening in their digestive system • Flatworms also have a excretory system • Flame cells: a network of bulb-like cells with flagella that push water and a ‘urine-like’ substance out of the skin • Beginning of cephalization: having a head • Two eye spots enable it to distinguish between light and dark

  3. Gas Exchange: diffusion • Circulation: diffusion • Excretion: flame cells • Digestion/feeding: incomplete digestive system with one opening; the pharynx • Reproduction: hermaphroditic (possess but male and female structures. Capable of regeneration if cut in half • Response to environment: eye spots allow for distinguishing between light and dark • Movement: motile, may attach to host if parasitic

  4. Many flatworms are parasitic: • Trematods attach themselves within the bodies of their hosts by means of suckers, hooks, or anchors • Most have a life cycle with two hosts: • The first is always a snail • The second (adult) is almost always a vertebrate

  5. The beef tapeworm: • About 1% of cattle in the U.S. are infected • 20% of beef consumed is not inspected • Humans can be infected by consuming beef ‘rare’ • http://animal.discovery.com/videos/monsters-inside-me/

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