Metazoa | Platyhelminthes | Trematoda | Strigeidida | Diplostomidae | Posthodiplostomum
Biota | Animalia | Platyhelminthes | Rhabditophora | Neodermata | Trematoda | Digenea | Diplostomida | Diplostomata | Diplostomoidea | Diplostomidae | Crassiphialinae | Posthodiplostomum | Posthodiplostomum orchilongum
|  | Minot, 1876 | Ehlers, 1985 | Ehlers, 1985 |  | Carus, 1863 | Olson, Cribb, Tkach, Bray & Littlewood, 2003 | Olson, Cribb, Tkach, Bray & Littlewood, 2003 | Poirier, 1886 | Poirier, 1886 | Sudarikov, 1960 | Dubois, 1936 | Noble, 1936