Term
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Definition
Non-living, outer layer secreted by epidermis/hydrodermis (living cell layer)
Restricts growth
Must be molted via ecdysis
Shed between each juvenile stage
Hormonal regulation:ecdysone |
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Term
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Definition
Has no shared body plan (worm-like)
Pseudocoelomates (Nematoda, nematomorpha, kinorhyncha, ?priapulida?)
Loricifera (pseudocoelomates and acoelomates)
Panarthropoda (eucoelomates) |
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Term
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Definition
| Primary protein in cuticle |
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Term
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Definition
Longitudinal muscles
Hydrostatic skeleton |
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Term
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Definition
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Term
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Definition
Internal fertilization
Sperm lack flagella
Once inside, sperm become ameboid and moves by pseudopodia |
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Term
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Definition
Ancylostoma duodenale
Necator americanus
Contact with infected soil
Trichina encysted juveniles in human muscle |
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Term
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Definition
Enterobius vermicularis
Most common
30% children, 16% adults
Females lay eggs on anus skin-leads to itching
Contaminates hands, bed sheets, clothes
Eggs swallowed |
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Term
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Definition
Ascaris lumbricoides
Humans eat contaminated food w/ shelled juveniles
Juveniles burrow through intestinal wall
Carried through heart to lungs (pneumonia)
Coughed up to trachea
Swallowed, mature in intestine, reproduce |
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Term
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Definition
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Term
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Definition
Eight species infect humans
Microfilariae (live young in blood and lymph)
Mosquitoes ingest microfilariae and transmit them |
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Term
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Definition
"Horsehair worms"
Adults (free living, soil)
Juveniles (parasites of arthropods)
Larvae do not emerge until near water
Paratenic host (transport host) not necessary |
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Term
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Definition
Not metameric
Head, neck, trunk segments w/ 11 external segments
Scalids (recurved spines, locomotion)
Live in marine mud sediments |
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Term
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Definition
Carnivorous marine worms
Cold waters of both hemispheres
Burrow head up in marine mud sediment |
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Term
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Definition
Recently discovered (1983)
Body can retract into circular lorica
Marine sediment (grains of sands)
Has scalids |
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