Species [var. antilopaeum] :
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).
[var. polymazum] :
[ var. dimazum]:
[ var. javanicum]:
[ var. heimansii]:
[ var. laeve]:
etc.
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