A genus of small, slender nematodes (family Trichostrongylidae) inhabiting the small intestine, rarely the abomasum, of ruminants; when fresh they are a bright pink color; they produce serious effects only when present in large numbers. In partly immune animals, these worms become enclosed in nodules in the wall of the intestine; they are less pathogenic in sheep and goats than the trichostrongyles Haemonchus, Ostertagia, and Trichostrongylus. Abbreviated taxonomy: Nematoda, Chromadorea, Rhabditida, Strongylida, Trichostrongyloidea, Cooperiidae
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Examples: glitazone, GI cocktail, etc.