Genus: Subgenus: with arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Section: Hoplastrum (Apexes of semicells with projections; arm-like projections granulated or dented).
Species: cell body excluding spines 28-44 μm long, 62-73 μm wide (with spines), constriction 85-15 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977)

S sexangulare v. sexangulare μm Water reservoir Iiyama Nagano, 2008	S sexangulare v. sexangulare μm Ko-numa 1 Minakami Gunma, 2008
S sexangulare v. subglabrum 37 x 53 μm Kitayama park Nishi-no-miya Hyogo, 2004	S sexangulare v. subglabrum 60 x 90 μm Kashibaru marsh Karatsu Saga, 2006	S sexangulare v. subglabrum μm Kashibaru m.4 Karatsu Saga, 2008	S sexangulare v. subglabrum μm Kashibaru m.II Karatsu Saga, 2008
S sexangulare v. subglabrum μm Kashibaru m.2-4 Karatsu Saga, 2008	S sexangulare v. subglabrum μm Kashibaru m.4 Karatsu Saga, 2008	S sexangulare v. subglabrum ? μm Hiroshima Univ. Hiroshima, 1998 Movies

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