Section [ Actinotaenium ]: Cell body cylindrical, slightly constricted at the center, cell surface smooth or dotted or punctated (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body medium in size, 65-(67-79) μm long, 38-40-(41-45) μm wide, isthmus 37-(39-41) μm wide, L/W=1.5; semicells semielliptical, with slightly flattened apex, apical view circular; cell wall dotted (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. australe 87 x 53 μm Zaike Sakura-ku Saitama, 2004	C. australe 71 x 42 μm Yamagata, 1999	C. australe μm Omine-numa Tsukiyono Gunma, 2003	C. australe 78 x 43 μm Omine-numa Minakami Gunma, 2007
C. australe 92 x 47 μm near Omine mt. Minakami Gunma, 2007	C. australe μm Miyatoko m.5 Minami-Aizu Fukushima, 2008	C. australe 69 x 44 μm Tajima Fukushima, 2004	C. australe ? 70 x 53 μm near Karakemi marsh Omachi Nagano, 2005
C. australe μm n. Yamakado m. Nishi-Azai Shiga, 2008	C. australe ? 91 x 55 μm Kashibaru m. 5 Karatsu Saga, 2006

Similar species -- >> C. capax;

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