Subgenus: Eustaurastrum

Family: Cell wall with 2 or more partitions
Subfamily: Cell division occurs at central constriction
Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells.
Subgenus: with arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)

Section: Glabriformes (Arm-like projections smooth)
S. brachiatum 16 samples 22-35 x μm 2004-2008	S. subtilissimum ? x 15 μm Omine-numa Tsukiyono Gunma, 2004
Section: Processiformes (Arm-like projections granulated or dented)
2 arm-like projections
S. johnsonii, S. leptocladum, S. subparvulum, S. biexcavatum, S. iotanum (2 or 3), S. leptocladumm, S. playfairi, S. tetracerum (2 or 3), S. sp.1
3 arm-like projections
S. aculeatum, S. anatinum, S. dorsidentiferum, S. gracile, S. inflexum, S. iotanum (2 or 3), S. longiradiatum, S. oxyacanthum, S. pseudosebaldi, S. polymorphum, S. sebaldi, S. tetracerum (2 or 3), S. vestitum (2 or 3), S. sp. 1-3
4 arm-like projections
S. bibrachatum, S. crenulatum, S. dentatum, S. margaritaceum, S. proboscideum, S. rhynchoceps, S. zonatum, S. polymorphum, sp.1-7
5 arm-like projections
Staurastrum sp. S. arachne ? μm USA, 1999	S. arachne 6 samples x 40-48 μm 2006-2008	S incisum 5 samples 23- μm 1999-2005	S. asteroideum 3 samples 22-36 x μm 2004-2005
Staurastrum sp. 2 samples 22-25 x μm 2007	S. crenulatum v. continentale ? μm Kejo-numa Furukawa Miyagi, 2003	S. incurvum 25 x 30 μm Kenashitai Hakkoda mountain Aomori, 2005	S. acanthastrum μm Water reservoir Nakatsugawa Gifu, 2008
6 arm-like projections
S pentacrinum μm USA, 1999	S asterias 5 samples μm 1999-2003
7 arm-like projections or arm number unidentified
S. rotula μm Uruguay, 1999	Staurastrum sp. μm Uruguay, 1999	Staurastrum sp. x 640 Uruguay, 1999
Section: Radiatiformes (Apexes of semicells with projections; arm-like projections smooth)
S. arctiscon μm Lake Biwa Maibara Shiga, 2008	S tohopekaligense 4 samples μm 1998-2008	S. subarmigerum 30 x μm Kashibaru m.II Karatsu Saga, 2008	S. hantzii v. japonicum 27 x μm Imou bog Toyohashi Aichi, 2004
S. hantzii v. japonicum 30 x μm Kareki-numa Nikko Tochigi, 2008.9	S. gemelliparum ? 20 x 20 μm Kashibaru m.5 Karatsu Saga, 2006
Section: Hoplastrum (Apexes of semicells with projections; arm-like projections granulated or dented)
S. sexangulare 9 samples 37-60 μm 1998-2008

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