Phylum Annelida Lamarck, 1809 - segmented worms Class Polychaeta Grube, 1850 - polychaetes Order Phyllodocida Dales, 1962 Superfamily Nereidoidea see Suborder Nereidiformia Family Syllidae Grube, 1850 Subfamily Eusyllinae Rioja, 1925 Genus Ophisthodonta Langerhans, 1879 see Genus Opisthodonta Langerhans, 1879