Annelida Lamarck, 1809 - segmented worms Class Oligochaeta Grube, 1850 - oligochaetes see [unranked] oligochaetous Clitellata Order Tubificida 1 Family Tubificidae Vejdovský, 1876 - sludge worms see Family Naididae Ehrenberg, 1828 2 Family Naididae Ehrenberg, 1828 - naidids