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.

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