Phylum Annelida Lamarck, 1809 - segmented worms Class Polychaeta Grube, 1850 - polychaetes Order Spionida Rouse & Fauchald, 1997 Family Spionidae Grube, 1850 Genus Prionospio Malmgren, 1867 Subgenus Minuspio Foster, 1971