Subgenus: Eustaurastrum
Section: Processiformes

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: Arm-like projections granulated or dented

4 arm-like projections
Staurastrum sp. μm USA, 1999	Staurastrum sp. μm USA, 1999	Staurastrum sp. μm USA, 1999	Staurastrum sp. 35 x 30 μm USA, 1999
Staurastrum sp. μm Japan, 1998	S. crenulatum v. crenulatum μm USA, 1999	Staurastrum sp. 4 arms ? μm Japan, 1998
S. bibrachatum μm Showa Memorial p. Tokyo, 2001	S. bibrachatum 31 x 32 μm Univ. A.V.M. Obihiro Hokkaido, 2005	S. dentatum v. gracilis ?? x 35 μm Iroha-numa 1 Zao mountain Yamagata, 2006
S. proboscideum 40 x 30 μm Tenbo marsh Tsugaike highland Nagano, 2005	S. margaritaceum 30 x 28 μm Midagahara 3 Tate-yama Toyama, 2006	S. margaritaceum 32 x 23 μm near Meigetsuso Azuma mt. Yamagata, 2007	S. margaritaceum μm Yokotashiro Katashina Gunma, 2007
S. margaritaceum ? μm near Hachimantai M. Hachimantai Iwate, 2007	S. rhynchoceps μm Tanohara m.3 Shiga highland Nagano, 2007	Staurastrum sp. 4 arms ? μm Sanda Hyogo, 2001
S. zonatum v. zonatum 26 x μm Kareki-numa Nikko Tochigi, 2008	S. zonatum v. emarginatum ? 26 x μm Iroha-numa 2 Zao mountain Yamagata, 2006	S. zonatum v. emarginatum ? x 40 μm Iroha-numa 3 Zao mountain Yamagata, 2006	S. zonatum v. emarginatum ? x 40 μm Iroha-numa Zao mountain Yamagata, 2008
S. polymorphum v. pygmaeum ? 30 x 37 μm Utsubo-numa Zao Mt. Yamagata, 2008

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