Genus:
Variable in shape; strong constriction at center; semicell ellipsoidal, polygonal, etc.;
cell wall with simple or branching spines, most of them laterally aligned;
4 plate-like chloroplasts in each semicell; one or more pyrenoids in each chloroplast
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species (var. antilopauem) : Cell body 45-72 μm long, 43-71 μm wide, L/W = 1, constriction 13-25 μm wide, spines 19-22 μm long, semicells with 4 spines (2 anterior, 2 basal), cell wall at the center of semicells thickened and punctated (Illustrations of The Japanese Fresh-water Algae, 1977).
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50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
X. antilopaeum (Brébisson) Kützing var. antilopauem,
semicells with 4 spines (2 anterior, 2 basal),
cell wall at the center of semicells thickened and punctated ?,
cell body μm long, μm wide,
constriction μm wide, spines slightly curved upward μm long,
x 400, x 640, Hiroshima, Japan, October 1998, by Y. Tsukii
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
X. antilopaeum (Brébisson) Kützing var. antilopauem: Cell body 45-72 μm long, 43-71 μm wide, L/W = 1, constriction 13-25 μm wide, spines 19-22 μm long, semicells with 4 spines (2 anterior, 2 basal), cell wall at the center of semicells thickened and punctated (Illustrations of The Japanese Fresh-water Algae, 1977).
X. antilopaeum var. laeve Schmidle: Cell body 79-90 μm long, 62-79 μm wide, constriction 20-34 μm wide, spines 19-22 μm long, semicells with 4 spines (2 anterior, 2 basal), cell wall at the center of semicells without thickened and punctated (Illustrations of The Japanese Fresh-water Algae, 1977).
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