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42 Cards in this Set
- Front
- Back
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Flatworms
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Phylum Platyhelminthes
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Two Sided,right and left, only can be divided equally by one plane(cut in half). Flatworms are arranged this way.
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Bilateral Symmetry
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Concentration of newons tissues at the anterior end, BRAIN
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CEPHALIZATION
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Without a body cavity
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Acoelomate
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Dorsal
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Top
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Ventral
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Bottom
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Anterior
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Front
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Posterior
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REAR
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Three Classes
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Turbellaria
Trematoda Cestoda |
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Trematoda
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Parasitic flukes
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Endoparasites
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Lives inside host
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Tegument
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Thick layer of cells to protect them from being digested
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Ectoparasites
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Lives on the outside of their hosts
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Turbellaria
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Free living, mostly marine,freshwater, most common is the Planeria. Lives under rocks in streams and ponds.
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Asexual
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In the summer they sttach their posterior ends and strech and tear in two. Have almost total regeneration
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Sexual
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Hermaphodites, cross fertilization
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Degeneration
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Lost certain characteristics of their ancestors, backwards evolution.
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Trematoda
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No digestive system, sucker used to attach to their host, no sense organs, no movement. Known as flukes. All parasitic. Asian liver fluke, sheep liver fluke
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Schistosoma
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blood flukes, passes through the skin from the water, kills 800,000 per year, infects 200 million in tropical regions.
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Clonorchis sinesis
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human liver fluke, get it by eating infected fish
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Cestoda
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Parasitic TAPEWORMS, Adult stage permentaly attach to intestinal wall of host, no digestive system
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digestion
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absorbs food from the host's intestine directly through their skin
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Proglottids
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Rest of teh tapeworm- rectangular body sections masses of reproductive organs, oldest at posterior ends
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scolex
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Head of tapeworm.knob shaped head with hooks and/or suckers
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Cysts
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larval tapeworms inside the meat, kill them by cooking
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Phylum Rynchocoela
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Free living Marine worms
Length 1-100 ft have a circulatory system and a digest tube that is open on both ends |
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Phylum Nematoda
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Unsegmented roundworms
Pseudocelom Free Living Parasites |
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PSEUDOCOELOM
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False Cavity, cavity between middle layer and inner layer
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FREE LIVING
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Most Roundworms
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PARASITES
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About 50 species parasitize plants and animals
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ASCARIS
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Infects human intestines, eggs carried to soil in human waste, eggs can live for years
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NEMATODA EGGS Devlop Where?
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In the intestines and bore through the walls into blood vessels where they enter the blood and travel to the lungs
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How do the worms return to th eintestine to mate?
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Animal coughs them up and then swallows them, they mate, and their eggs pass out in waste.
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Necator
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Hookworms, bores through bare feet
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Trichinella
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Parasitic roundworms in pigs that causes trichinosis in humans. Cooking/freezing kills it.
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PHYLUM ROTIFERA
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Have a row a cilia around the mouth
feed on bacteria and protists and are well developed one way gut. |
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Flatworms have these systems
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Distinct centralized nrevous system, simple excretory system, and a complex reproductive system, a prmitive intestine (one opening for food and waste)
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What can Flatworms do to humans?
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Flatworms can cause misery and early death.
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Pork Tape Worm attaches to it host by what?
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4 suckers and a row of hooks
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Beef Tapeworms attach to its host by what?
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4 suckers
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Fish Tapeworm attaches to it's hosts by what?
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two groovelike attachment organs. NO hooks or suckers.
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Dog Tapeworm attaches to it's hosts by what?
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4 suckers, lots of hooks.
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