Abstract
Two series of collections in Lake Patzcuaro, Michoacan, Mexico, made with the purpose of investigating the presence of schistosome - dermatitis (swimmer's itch) have yielded negative results in the snails collected-Physa mexicana tolucensis, Helisoma tenuis boucardi, Sphaerium triangularis and S. subtransversum. A new distome, leptocercous, gymnocephalous cercaria was obtained from Physa mexicana tolucensis, and described here as Cercaria patzcuarensis n. sp.Comments
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