Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977)
Subgenus: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Section [Raphidiastrum]:
Species:

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S. subteliferum cell x 35 μm spines 8 μm Vermont-Maine USA, 1999	S. subteliferum ? cell 35 x 33 μm spines 15 μm Uruguay, 1999	S. subteliferum μm Kashibaru m.II Karatsu Saga, 2008	S. subteliferum or S. teliferum ? μm Water reservoir Iiyama Nagano, 2008

Similar species -->> S. teliferum (spines thick, short, many); S. gladiosum (spines thin, long, many); S. hirsutum (spines thin, short, many);

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