Definition: A genus of operculate snails (family Pleuroceriidae, subclass Prosobranchiata). An Asian form, Semisulcospina libertina, is the first intermediate host of a number of trematodes, including Paragonimus westermani.
[semi- + L. sulcus, a furrow + spina, thorn, spine]
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Examples: glitazone, GI cocktail, etc.