Family: Body ellipsoidal, uniformly ciliated; hypostomial frange short; prominent cytopharyngeal apparatus
(Carey, 1992).
Genus: Oral aperture small, oval (Carey, 1992). Species: |
100 μm
200 μm
300 μm; x 200
50 μm
100 μm
150 μm; x 400
31 μm
63 μm
94 μm; x 640
Nassula sp. (N. aurea ?),
cell body 310 μm long, 256 μm wide,
cyrtos about 150 μm long,
trichocysts rare, 12-13 μm long, 1.5 μm wide,
x 640, Koaze river, Kawagoe city, Saitama Pref., Japan, March 2002 by Y. Tsukii
50 μm
100 μm
150 μm; x 400
31 μm
63 μm
94 μm; x 640
Nassula ornata Ehrenberg, 1833: 250 μm long, 180 μm wide (Kahl, 1931). Ovoid, 250 μm long; frange presents; a single contractile vacuole lie in the mid-body region; macronucleus with at least three micronuclei; many trichocysts present (Carey, 1992).
* Nassula aurea Ehrenberg, 1833: 250 μm long; L/W=2 (Kahl, 1931). Ovoid or elliptical, 250 μm long; reduced frange presents; long cytopharyngeal apparatus "cyrtos" presents; macronucleus with 2 to 4 micronuclei; a single contractile vacuole; trichocysts absent (Carey, 1992).
Nassula terminalis Ozaki & Yagiu, 1941: Ovoid, flattened and flexible; 150-210 μm long; anterior quarter narrower than the rest of the body; cytopharyngeal opening very long; macronucleus ovoid; single micronucleus; single contractile vacuole terminal; trichocysts absent (Carey, 1992).