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