Nassophorea:
Nassulida: Nassulina: Nassulidae
Nassula elegans
Ehrenberg, 1833
Family: Body ellipsoidal, uniformly ciliated; hypostomial frange short; prominent cytopharyngeal apparatus
(Carey, 1992).
Genus: Oral aperture small, oval (Carey, 1992).
Species: Cell body elongate and cylindrical, 200-300 μm long;
multiple contractile vacuoles (at least 5) in a straight line; trichocysts absent;
frange large and distinct; cytopharyngeal basket long; macronucleus ellipsoidal (Carey, 1992).
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Similar species --> Paranassula
Nassula elegans Ehrenberg ?,
cell body (left) 177 μm long, 71 μm wide, L/W=2.5,
x 400, x 640, Kurome river, Asaka city, Saitama Pref., Japan, January 8, 2006 by Y. Tsukii
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
A cell ingesting a trichome of Oscillatoria sp., 300 μm long, 90 μm wide, L/W=3.3, x 200, x 400, x 640
A cell ingesting a trichome of Oscillatoria sp. (4 x 11 μm), μm long, μm wide, L/W=, x 200, x 400, x 640
A conjugating pair, cell body (left) 220 μm long, 110 μm wide, L/W=2.0, x 200, x 400, x 640
A cell undergoing encystment 135 μm long, 80 μm wide, L/W=1.7, x 200, x 400, x 640
Cysts 103 μm long, 93 μm wide, L/W=1.1, x 400, 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 elegans 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).
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