Tetrameres

A genus of stomach-infecting parasitic nematodes (family Spiruridae) of birds. When filled with eggs, the female worm is enormously enlarged and has a globular, blood-red appearance. Species include T. americana, found in the proventriculus of chickens (sometimes severely pathogenic in young chicks), turkeys, grouse, and quail, and transmitted by infected cockroaches and grasshoppers, and T. fissispina, found in the proventriculum of ducks, geese, wild waterfowl, pigeons, and doves but rarely in gallinaceous birds. [see tetrameric]

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Te·tram·er·es (tĕ-tramґər-ēz) a genus of nematodes parasitic in the alimentary tract of chickens and other fowl. T. americaґna is found in the proventriculus of chickens and other birds; heavy infestations may be fatal to young birds.