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15 Cards in this Set
- Front
- Back
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Cause of swimmer's itch (cercarial dermatitis) |
allergic reaction to lost/dead schistosome cercariae that have penetrated the skin |
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How are schistosomes different than other digeneans? |
1. schistosome cercariae actively seek host instead of forming cysts and waiting to be eaten 2. non-schistosomes all leave humans in feces (or sputum) 3. they are all parasites of the circulatory system 4. monogamous 5. eggs have spines 6. snails are their only IH and humans only DH |
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Aspidogastrea/Aspidobothrea larvae |
cotylocidium |
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Monogenea larvae |
oncomiracidium |
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Digenean trematode life cycle |
Eggs - miracidia - encyst in IH mollusk - sporocysts/redia - cercariae - 2nd IH - metacercariae - eaten by DH - matures to adult |
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Monogenean trematode life cycles |
oviparous: eggs - oncomiracidia - adult - eggs viviparous: adult - oncomiracidia - adult |
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Characteristics of Platyhelminthes |
flat, bilateral incomplete/no digestive system excretion by protonophria syncitious tegument cephalized NS no mesoderm and acoelmate most are hermaphroditic attach by sucker, scolex, hooks, clamps, anchors |
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Stages of pseudophyllidean cestodes (Diphyllobothrium latum (Gelfite fish)) |
egg (with operculum) - coracidium -eaten by 1st IH crustacean - procercoid develops - eated by 2nd IH - plerocercoid develops - eaten by 3rd IH - adult develops - eaten by DH |
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Neurocysticercosis
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caused by cyclophyllidean Taenia solium when eggs are accidentally ingested by humans and get lodged in the brain |
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Cystic echinococcosis |
development of cyclophyllidean E. granulosa larvae in liver and lungs uniocular hydatid cyst containing protoscolices |
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Alveolar echinococcosis |
development of cyclophyllidean E. multiocularis larvae in liver alveolar/multiocular hydatid cysts spread thru tissues |
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Parasites that impact farming industry |
Fasciola hepatica (sheep liver fluke) Dicrocoelium dendriticum (ant mind controller) Echinococcus granulosa (sheep tapeworm) |
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Parasites that impact fisharies |
Dactylogyrus spp. (fish gills) Gyrodactylus spp. (fish skin) |
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Sporocysts |
sac of embryos, embryos can become sporocysts, redia, or cercaria absorbs nutrients thru tegument, no mouth |
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Redia |
makes embryos that can turn into reia or cercaria act as soldiers has a pharynx and small digestive system more mobile than sporocysts |
