Acanthostomum Looss, 1899 (original description)
Acanthostomum spiniceps (Looss, 1896) Looss, 1899 (new combination reference)
Accacoelium Monticelli, 1893 (additional source)
Accacoelium contortum (Rudolphi, 1819) Looss, 1899 (new combination reference)
Ascocotyle Looss, 1899 (original description)
Ascocotyle coleostoma (Looss, 1896) Looss, 1899 (new combination reference)
Ascocotyle coleostoma (Looss, 1896) Looss, 1899 (additional source)
Asymphylodora Looss, 1899 (original description)
Brachycladium Looss, 1899 (original description)
Brachycladium delphini (Poirier, 1886) Looss, 1899 (new combination reference)
Brachycladium palliatum (Looss, 1885) Looss, 1899 (new combination reference)
Brachycoeliidae Looss, 1899 (original description)
Cymatocarpus Looss, 1899 (original description)
Dicrocoeliidae Looss, 1899 (original description)
Dicrocoeliinae Looss, 1899 (original description)
Echinostoma revolutum (Fröhlich, 1802) Looss, 1899 (new combination reference)
Echinostomatidae Looss, 1899 (original description)
Echinostomatinae Looss, 1899 (original description)
Galactosomum Looss, 1899 (original description)
Galactosomum lacteum (Jägerskiöld, 1896) Looss, 1899 (new combination reference)
Gorgoderidae Looss, 1899 (original description)
Gorgoderinae Looss, 1899 (original description)
Hapalotrema Looss, 1899 (original description)
Hapalotrema constrictum (Leared, 1862) Looss, 1899 accepted as Hapalotrema mistroides (Monticelli, 1896) Stiles & Hassall, 1908 (new combination reference)
Hapalotrema constrictum (Leared, 1862) Looss, 1899 accepted as Hapalotrema mistroides (Monticelli, 1896) Stiles & Hassall, 1908 (redescription)
Hemiuridae Looss, 1899 (original description)
Hemiurinae Looss, 1899 (original description)
Hemiurus appendiculatus (Rudolphi, 1802) Looss, 1899 (new combination reference)
Metorchis Looss, 1899 (original description)
Opisthorchiidae Looss, 1899 (original description)
Opisthorchiinae Looss, 1899 (original description)
Philophthalmidae Looss, 1899 (original description)
Philophthalminae Looss, 1899 (original description)
Philophthalmus Looss, 1899 (original description)
Philophthalmus lucipetus (Rudolphi, 1819) Looss, 1899 (new combination reference)
Progonus Looss, 1899 (original description)
Progonus muelleri (Levinsen, 1881) Looss, 1899 (new combination reference)
Pronocephalidae Looss, 1899 (original description)
Psilostomum Looss, 1899 (original description)
Pyelosomum Looss, 1899 (original description)
Stephanostomum Looss, 1899 (original description)
Stephanostomum cesticillus (Molin, 1858) Looss, 1899 (new combination reference)
Stephanostomum pristis (Deslongchamps, 1824) Looss, 1899 (new combination reference)
Stictodora Looss, 1899 (original description)
Stictodora sawakinensis Looss, 1899 (original description)
Syncoeliidae Looss, 1899 (original description)
Syncoeliinae Looss, 1899 (original description)
Telorchiidae Looss, 1899 (original description)
Telorchiinae Looss, 1899 (original description)
Telorchis Lühe, 1899 nec Looss, 1899 (additional source)