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Ectoparasites on fish one in mammals
Class monogenea tapeworms
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live only in mollusks
Class Turbellaria subc aspidogastrea
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at least 2 hosts in life cycle class
turbellaria subc digenea bilaterally symmetrical, triploblastic, acoelomate
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trematodes lack..
circulatory, skeletal, respiratory systems mouth is responsible for ins and outs
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flame cells-terminal tubules-collecting tubules-excretory bladder
osmoregulatory system
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cerebral ganglion-longitudinal nerve cords-transverse ring commisures
orthagon nervous system
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chemoreceptors, tangoreceptors
types of trematode receptors monoecicus except schistose
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loses cilia, gain tegument, no digestive tract, germinal sac
sporocyst rudimentary digestive tract, germ balls,
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Haemocyte mobility is reduced, lose adhesion, lower superoxide and phagocyte
interference hypothesis
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redia move to reproductive structure of snail feed on and destroy
parasitic castration
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peptide hormone overproduced with larval infection
hormone manipulation exits snail via escape glands, lives 1-3 days
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Infects 2nd IH
Type B Cercaria
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infects DH directly
Type C cercaria
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Post-acetabular glands attach, pre-acetabular glands penetrate
infection of host
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egg-metacerc-sporocyst
metamorphosis stage
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many radia-many cerc-many metacerc
proliferation increases chance of host being ingested parasite influences physical attributes
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anucleate area of syncytium, multilamellar vesicles, discoid bodies
distal cytoplasm
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nuclei and organelles, repair and maintenance of distal cytoplasm
proximal cytoplasm
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