Platyhelminthes, Nematoda, Annelida. Phylum Platyhelminthes Flatworms - Dorsoventrally flattened...
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Transcript of Platyhelminthes, Nematoda, Annelida. Phylum Platyhelminthes Flatworms - Dorsoventrally flattened...
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Platyhelminthes, Nematoda, Annelida
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Phylum Platyhelminthes
• Flatworms - Dorsoventrally flattened (top to bottom)
• Digestive tract has one opening (incomplete)• Simple nervous system• No true circulatory or respiratory systems
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Planaria
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PlanariaRegeneration
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Lined Flatworm
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Tapeworm
parasitic
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Tapeworm
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Tapeworm in a Carp
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Tapeworm
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Tapeworms in dogs &
cats
Flea larvae
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Flukes
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Phylum Nematoda
• Long, tapered, cylindrical shape
• Longitudinal muscles
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Phylum Nematoda
• Long, tapered, cylindrical shape• Longitudinal muscles• Complete Digestive system• No circulatory or respiratory systems
Roundworms
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Parasitic Nematodes
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Hookworms
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Roundworm Life Cycle
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Phylum Annelida
• Segmented worms• Coelom (body
cavity)• Circular muscles• Circulatory system
(closed system)
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Class Polychaeta
• “many bristles”
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Bristle Worm
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Christmas Tree Worm
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Star Horseshoe
Worm
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Plume Worm
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Social Feather Duster Worms
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Medusa Worm
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Class Oligochaeta“few bristles”
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Earthworm Movement
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Earthworms Mating
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Class Hirudinea• No bristles
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Leech’s Mouth
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