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 Prosphaerosyllis San Martin, 1984 Subgenus Sphaerosyllis Claparède, 1863