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Overview of Flatworms and Roundworms
Overview of Flatworms and Roundworms
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32 Terms
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Platyhelminthes
Phylum containing flatworms, including three classes.
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Turbellarian
Class of free-living flatworms, e.g., Planaria.
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Planaria
Example of Turbellarian, exhibits cephalization.
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Cephalization
Development of a head region in organisms.
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Bilateral symmetry
Body plan with symmetrical left and right sides.
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Hermaphrodites
Organisms possessing both male and female reproductive organs.
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Cross-fertilization
Sexual reproduction involving two different individuals.
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Asexual reproduction
Reproduction without the involvement of gametes.
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Mesoderm
Middle layer of cells in triploblastic organisms.
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Trematoda
Class of parasitic flatworms, known as flukes.
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Chinese Liver Fluke
Example of a Trematode that infects the liver.
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Cestoda
Class of parasitic flatworms, known as tapeworms.
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Scolex
Head of a tapeworm with hooks for attachment.
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Nematoda
Phylum of roundworms, including hookworm and filaria.
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Filaria
Worm causing elephantiasis, transmitted by mosquitoes.
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Trichinosis
Disease caused by consuming undercooked infected meat.
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Annelida
Phylum of segmented worms, including earthworms.
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Oligochaeta
Class of Annelida, includes earthworms and leeches.
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Symptoms of Tapeworms
Nausea, weakness, diarrhea, abdominal pain, fatigue.
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Longest Tapeworm
Recorded length of 30 feet in humans.
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Characteristics of Planaria
1. Free-living
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2. Non-parasitic
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3. Bilateral in shape
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4. Exhibits cephalization: has a head
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5. moves away from light ( crossed eye spots)
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6. Has a brain
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7. Has definite organs
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8. Has a digestive system ( its mouth is its' anus)
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9. They are hermaphrodites
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10. They can reproduce sexually by cross-fertilization
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11. They can reproduce asexually ( by cutting it in half)
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Triploblastic
they have 3 layers of cells...the middle layer is known as the mesoderm
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