Subgenus: with arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species [var. pseudosebaldi]: Cell body cylindrical, 39 μm long, 50.4 μm wide, isthmus 11 μm; in apical view, four dichotomous short spines arranged in each margin; a single line of dented projections present near the isthmus in each semicell.
[var. basidenticulatum]: Cell body smaller than var. pseudosebaldi, 44 μm long, 51 μm wide, isthmus 11 μm wide; in apical view, four dichotomous warts arranged in each margin; two lines of short spines present near the isthmus in each semicell.
[var. simplicius]: Cel lbody small, 32.3 μm long, 51-52 μm (including arms), isthmus 8.6 μm wide; in apical view, short spiny warts arranged in each margin; a single line of dented projections present near the isthmus in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977)

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var. pseudosebaldi
v. pseudosebaldi ? μm Maimeno-ike 3 Norikura highland Nagano, 2007
var. basidenticulatum
v. basidenticulatum 42 x 50 μm Tashirodaira m.5 Hakkoda mountain Aomori, 2006	v. basidenticulatum 42 x 42 μm Maimeno-ike Norikura highland Nagano, 2006	v. basidenticulatum 39 x 46 μm Maimeno-ike Norikura highland Nagano, 2006	v. basidenticulatum μm Maimeno-ike Norikura highland Nagano, 2007.11
v. basidenticulatum 32 x 40 μm Kashibaru m3 Karatsu Saga, 2006	v. basidenticulatum 42 x 50 μm Dojo-ike Norikura highland Nagano, 2006	v. basidenticulatum μm Dojo-ike Norikura highland Nagano, 2007.11	v. basidenticulatum 41 x 53 μm Azami-ike Norikura highland Nagano, 2006
var. simplicius
S pseudosebaldi 35 x 35 μm Kodanuki marsh Fujinomiya Shizuoka, 2006	v. simplicius 32 x 47 μm near Omine-numa Minakami Gunma, 2006	v. simplicius μm Ko-numa Minakami Gunma, 2008	v. simplicius μm Azami-ike 5 Norikura highland Nagano, 2007
v. simplicius ? 35 x 45 μm Ohnuma Nasu-shiobara Tochigi, 2006	v. simplicius ? 25 x 33 μm Okubo Ryoke Akigase park Saitama, 2005
S. pseudosebaldi or other species ?
S pseudosebaldi μm Hiroshima Univ. Hiroshima, 1998 Movies	S pseudosebaldi μm Daidarabotchi-ike Iizuna-kogen Nagano, 2003	S pseudosebaldi ? 29 x 36 μm Univ. A.V.M. Obihiro Hokkaido, 2005
S pseudosebaldi ? or S. manfeldtii ? 32 x 31 μm Aizu Recreation p. Aizuwakamatsu Fukushima, 2005	S pseudosebaldi or S. manfeldtii ? μm Umi-no-nakamichi Fukuoka, 2001	S pseudosebaldi or S. manfeldtii ? Vermont-Maine U.S.A., 1999	S pseudosebaldi ? 20 x 33 μm Saiko Toda Saitama, 2005
S pseudosebaldi or anatinum ? μm Showa Memorial p. Tokyo, 2001	S pseudosebaldi or anatinum ? stock Sua-2 Akigase Park Saitama, 2002	S pseudosebaldi or anatinum ? μm Hasuda Saitama, 2002	S pseudosebaldi or S. longiradiatum ? μm Otto-Numa Ibaraki, 2002
S pseudosebaldi or S. gracile ? 32 x 47 μm Imou bog Toyohashi Aichi, 2004	S pseudosebaldi or S. gracile ? μm Higashi-sano Hakuba Nagano, 2004	S pseudosebaldi ? 29 x 39 μm water reservoir near Yamaguchi Univ. Yamaguchi, 2004

Similar species -->> S. sebaldi;

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