| molecular and morphological evidence for the holarctic distribution of urogonimus macrostomus (rudolphi, 1803) monticelli, 1888 (digenea: leucochloridiidae). | species of urogonimus monticelli, 1888 (leucochloridiidae poche, 1907) are difficult to distinguish using adult morphology, and their taxonomy has been repeatedly subjected to revision. some nearctic species have been regarded as synonymous with the palearctic type species urogonimus macrostomus (rudolphi, 1803) monticelli, 1888. this implies that u. macrostomus is present in the nearctic, but there is no additional evidence for this putative distribution. we collected trematodes morphologically ... | 2012 | 22360608 |