Kingdom Animalia Linnaeus, 1758 - animals Phylum Annelida Lamarck, 1809 - segmented worms Class Oligochaeta Grube, 1850 - oligochaetes see [unranked] oligochaetous Clitellata Order Haplotaxida Family Tubificidae Vejdovský, 1876 - sludge worms see Family Naididae Ehrenberg, 1828 Genus Clitellio Savigny, 1820 Genus Limnodrilus Claparède, 1862 Genus Tubifex Lamarck, 1816