Annelida Lamarck, 1809 - segmented worms Class Oligochaeta Grube, 1850 - oligochaetes see [unranked] oligochaetous Clitellata Order Tubificida Family Naididae Ehrenberg, 1828 - naidids Genus Chaetogaster Baer, 1827 Chaetogaster cristallinus Vejdovský, 1883