Kingdom Animalia Linnaeus, 1758 - animals Phylum Annelida Lamarck, 1809 - segmented worms 1 Class Polychaeta Grube, 1850 - polychaetes 2 Class Myzostomida 3 Class Oligochaeta Grube, 1850 - oligochaetes see [unranked] oligochaetous Clitellata 4 Class Hirudinida