Kingdom Animalia Linnaeus, 1758 - animals Phylum Platyhelminthes Gegenbaur, 1859 - flatworms Class Turbellaria Ehrenberg, 1831 - planarians see Subphylum Turbellaria Ehrenberg, 1831 Order Catenulida Meixner, 1924 - catenulid flatworms Genus Stenostomum Schmidt, 1848