Suborder: Ventral cirri not as distinct files, except Gastrostyla. Family: Frontoventral cirri scattered on forward part, sometimes on rear part; never on mid area of ventrum (Illustrated Guide, 1985). Genus: Body lacks tail: cluster of 3 postoral cirri present; no frontoventral cirri behind that group (Illustrated Guide, 1985). Species:

50 μm 100 μm 150 μm; x 400 : 31 μm 63 μm 94 μm; x 640