 1 Natura - nature | | 2 Mundus Plinius - physical world | | 3 Naturalia - natural bodies | | 2 Biota | | 3.2 Domain Eukaryota Chatton, 1925 - eukaryotes | | 1 Unikonta | | 2.2 Opisthokonta Cavalier-Smith, 1987 | | 2 Holozoa | | 2.2.2 Kingdom Animalia C. Linnaeus, 1758 - animals | | 3 Epitheliozoa Ax, 1996 | | 2 Eumetazoa Bütschli, 1910 - eumetazoans | | 2 Bilateria Hatschek, 1888 - bilaterians | | 7 Eubilateria Ax, 1987 | | 1 Protostomia Grobben, 1908 | | 1.n Lophotrochozoa K.M. Halanych et al., 1995 - lophotrochozoans | | 2 Spiralia - spiralians | | 2.2.2.2 Trochozoa Beklemischev, 1944 - trochozoans | | 1 Phylum Annelida Lamarck, 1809 - segmented worms | | 3 Class Polychaeta Grube, 1850 - polychaetes |  3 Order Scolecida |  1.1.1.1.1.1 Family Arenicolidae Johnston, 1835 | | 1.1.1.1.1.2 Family Maldanidae Malmgren, 1867 | | 1.1.1.1.2 Family Capitellidae Grube, 1862 | | 1.1.1.2 Family Opheliidae Malmgren, 1867 | | 1.1.2 Family Scalibregmatidae Malmgren, 1867 | | 1.2.1.1 Family Orbiniidae Hartman, 1942 | | 1.2.1.2.1 ?Ichnogenus †Helminthoidea Schafhäutl, 1851 | | 1.2.1.2.2 Family Paraonidae Cerruti, 1909a, nom. cons. | | 1.2.2 Family Questidae O. Hartman, 1966 | | 2 Family Cossuridae Day, 1963 |
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