Paragonimus is a genus of flukes (trematodes). Some tens of species have been described, but they are difficult to distinguish, so it is not clear how many of the named species may be synonyms. The name Paragonimus is derived from the combination of two Greek words, “para” (on the side of) and “gonimos” (gonads or genitalia). Several of the species are known as lung flukes. In humans some of the species occur as zoonoses; the term for the condition is paragonimiasis. The first intermediate hosts of "Paragonimus" include at least 54 species of freshwater snails from superfamilies Cerithioidea and Rissooidea.