Phylum Annelida Lamarck, 1809 - segmented worms Class Polychaeta Grube, 1850 - polychaetes Order Sabellida Fauchald, 1977 Family Spirorbidae (Chamberlin, 1919) Pillai, 1970 1 Subfamily Spirorbinae Chamberlin, 1919 2 Subfamily Circeinae Knight-Jones, 1978 3 Subfamily Januinae Knight-Jones, 1978 4 Subfamily Pileolariinae Knight-Jones, 1978