Heterophyidae Flashcards
-small, usually not over 2mm long; body wider posteriorly than anteriorly
-cuticle covered with scale-like spines
-Ventral sucker located near middle of the body & maybe weak or absent
-Pharynx & long esophagus present
Family Heterophyidae
-Genital pore opens close to the ventral sucker & surrounded by genital sucker
-Testes slightly oval or lobed, horizontal or diagonal in position & located near the posterior end of the body
Family Heterophyidae
-Ovary slightly oval or lobed located anterior anterior to the testes
-Vitellaria lateral & restricted to the posterior part
-Coiled uterus at the posterior half of the body
Family Heterophyidae
Parasites of
Of intestines of mammals & birds
Species
Heterophyes heterophyes
Metagonimus yokogawai
Euryhelmis squamala
Euryhelmis monorchis
Cryptocotyle lingua
Apophallus donicum
Natural DH
Heterophyes heterophyes
Metagonimus yokogawai
Euryhelmis squamala
Euryhelmis monorchis
Cryptocotyle lingua
Apophallus donicum
-Dog, cat, fox, man
-Dog, cat, pig, man, pelican
-Fox, polecat, weasel, mink
-Mink
-Herring gull, common term, kittiwake, razorbill, grebe, night-heron, dogs, seal, fox, mink, man
-Cat, dog, fox, seal, man
Habitat
Heterophyes heterophyes
Metagonimus yokogawai
Euryhelmis squamala
Euryhelmis monorchis
Cryptocotyle lingua
Apophallus donicum
-small intestine
-small intestine
-intestine
-intestine
-intestine
-small intestine
Snail IH
Heterophyes heterophyes
Metagonimus yokogawai
Euryhelmis squamala
Euryhelmis monorchis
Cryptocotyle lingua
Apophallus donicum
-Pirenella conica, Cerithida cingulata
-Semisulcospira libertina
-Bythinella reyniesii
-Promatiopsis lapidaria
-Littorina littorea (common shore periwinkle)
-Flumenicola virens
2nd IH
Heterophyes heterophyes
Metagonimus yokogawai
Euryhelmis squamala
Euryhelmis monorchis
Cryptocotyle lingua
Apophallus donicum
-Mugil cephalus, Tilapia nilotica (fish)
-Cyprinid fish
-Frog (Rana temporaria)
-Frog (R. clamitans)
-Marine fish
-Cyprinid fish
Pathology of Heterophyes heterophyes
-fluke penetrate deeply into the mucosa & may cause slight desquamation
-In human cases diarrhea may develop which is usually intermittent & sometimes hemorrhagic
-Diagnosis is based on the demonstration of eggs in feces
Tx
Praziquantel administered orally is the drug of choice for tx of infection in man
A minute intestinal fluke (and smallest human fluke)
Metagonimus yokogawai
Metagonimus yokogawai life cycle
8 bullet
Geographic distribution
Mostly Far East, as well as Siberia, Manchuria, the Balkan states, Israel, and Spain
