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Lecture 13: Phylum Nematoda, Part 2 Parasitic Life Histories
Invertebrate Zoology Lecture 13: Phylum Nematoda, Part 2 Parasitic Life Histories
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Parasitic Life Cycles 1: Single host with a free-living stage.
Example: hookworms Overview Common intestinal parasites Affect 25% of the human population Primarily in the tropics Common in dogs, cats and other mammals Symptoms Severe anemia Skin infections
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Hookworm life cycle *See additional details in text
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Parasitic Life Cycles 2: Single host, direct host-host transmission
Example: trichina worms (Trichinella spp.) Overview Humans infected by eating raw or undercooked pork. May be the reason for religious bans against pig products. Symptoms Excruciating pain and fever from larval burrowing into muscles
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Trichina worm life cycle
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Example: Onchocerca volvulus (river blindness)
Parasitic Life Cycles 3: Filarial nematodes w/arthropod intermediate host Example: Onchocerca volvulus (river blindness) Overview Prevalent in Africa Symptoms Subcutaneous lesions, including lesions of the eye that cause blindness
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Onchocerca volvulus life cycle
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