Definition: A former generic name for strongyle (hookworm) nematodes and for trichostrongyle worms of horses; now replaced by other genera but still used as a collective term for this group. Species include Sclerostoma duodenale (Ancylostoma duodenale) and Sclerostoma syngamus (Syngamus tracheae).
[sclero- + G. stoma, mouth]
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Examples: glitazone, GI cocktail, etc.