Eukaryota  >  Metazoa  >  Arthropoda  >  Ichthyostraca

Order	Family	Genus	Species
Arguloida	1	3	38
Cephalobaenida	1	0	0
Porocephalida	5	10	51
Raillietiellida	1	1	11
Reighardiida	1	2	3