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 Exogoninae Rioja, 1925 Genus Sphaerosyllis Claparède, 1863 Subgenus Sphaerosyllis Claparède, 1863