Phylum Annelida Lamarck, 1809 - segmented worms Class Polychaeta Grube, 1850 - polychaetes Order Spionida Rouse & Fauchald, 1997 Family Apistobranchidae Mesnil & Caullery, 1898 Genus Apistobranchus Levinsen, 1883[1884]