Family & Genus: Circumferential paratene (cirrus-like "bristles") usually polykinetid; body small, rounded (Illustrated Guide, 1985). Genus: Spherical or broadly fusiform; anterior border bears conspicuous adoral zone (Kudo, 1966). Body circular or globular; AZM is composed of two sets membranelles; longer set emerges from the buccal cavity and wind around the apex of the cell; long, stiff cilia present equatorially; saltatorial locomotion quite common (Carey, 1992). Species:

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

Halteria ??, cell body μm long, μm wide, x 400, x 640, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, March 2001 by Y. Tsukii