Intestinal Helminths. Nematodes: Location in the human body Intestinal nematodes Tissue nematodes.
4 5 nematodes and annelids
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Transcript of 4 5 nematodes and annelids
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WORMS
•Platyhelminthes
•Nematodes
•Annelids
Annelids
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WORMS
•Platyhelminthes
•Nematodes
•Annelids
Annelids
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NematodesWhat must I learn?
• Round worms: Cylindrical and soft body with tapered end, not divided in segments.
• Most of them are free-living but some are parasitic and responsible for many diseases. (Pinworm, anisakis, trichina)
• No respiratory system.
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Nematodes
• Pinworms– Adults reside in the large intestine.– Enter humans by being eaten.
• Dracunculus• Hookworms
– Adults live in the small intestine of humans.– Enter host through the skin, usually between the toes. That makes you want to
walk around barefoot, doesn’t it?
• Anisakis• Trichina
– Live in humans & other omnivores (like piggys)– Adults live in the small intestine of it’s host; larvae encyst in the stomach and
skeletal tissue (ouch!). Enter host by being eaten.
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• Picture of a male nematode.
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M O V E M E N T
•No circular muscle in body walls
•Longitudinal muscle flexion combined with
high internal fluid pressure produces whip-
like wriggle
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WORMS
•Plathyelminthes
•Nematodes
•Annelids
Annelids
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Annelid Characteristics• The phylum includes
polychaetes, earthworms (Oligochaetes), and leeches.
• Cutaneous respiration in terrestrial and branchial respiration in marine.
True segmented worms• Metameric
segmentation
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Polychaete
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What do Oligochaetes look like?
Freshwater, very few marine and most terrestrial.
No parapodia.
Clitellum functions in reproduction.
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How do Oligochaetes reproduce and develop?
Sexual
Mutual cross-fertilization.
Cocoon formed by clitellum.
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Earthworm gathering
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Class Hirudinea (Leeches)
• Predominately freshwater, but do occur in all seas and moist soil
• Leeches do not burrow or crawl, lack parapods and setae
• Feed on blood
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Leech