Genus: Cell body elongate, cylindrical or spindle-shaped, apex dorso-ventrally compressed with a deep incision; centrally constricted to form 2 semicells; cell wall dotted or covered with small pores; chloroplasts consisting of axis and lateral laminae, pyrenoids arranging linearly along the axis; zygotes spherical, smooth or rectangular with rounded corners (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body 80-(160-184)-260 μm long, 20-(28-30)-50 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).

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T. granulatus 135 x 28 μm Sensho-ga-hara 9 Shizukuishi Iwate, 2007	T. granulatus 173 x 30 μm Sensho-ga-hara 13 Shizukuishi Iwate, 2007	T. granulatus 165 x 30 μm Mida-ga-hara Gassan Yamagata, 2005	T. granulatus 177-180 x 28-31 μm Numa-no-hara marsh Madarao highland Niigata, 2005
T. granulatus μm Miyatoko m.3 Minami-Aizu Fukushima, 2008	T. granulatus 127 x 25 μm Numappara marsh Nasu-shiobara Tochigi, 2007
T. granulatus 172-180 x 28-29 μm Shimo-no-koike Shiga highland Nagano, 2005	T. granulatus 160 x 26 μm Shimo-no-koike Shiga highland Nagano, 2004	T. granulatus 150 x 25 μm 162 x 30 μm Shimo-no-koike Shiga highland Nagano, 2004	T. granulatus 174 x 24 μm Shimo-no-koike Shiga highland Nagano, 2006
T. granulatus 185 x 30 μm Shimo-no-koike Shiga highland Nagano, 2007	T. granulatus 178 x 30 μm Shibu-ike Shiga highland Nagano, 2005	T. granulatus 188 x 28 μm Shijuhachi-ike 4 Shiga highland Nagano, 2007	T. granulatus μm Chigo-ike Shiga highland Nagano, 2008
T. granulatus 110 x 25 μm 105 x 24.5 μm Imou bog Toyohashi Aichi, 2004	T. granulatus 135 x 26 μm Koigakubo marsh Tessei-cho Okayama, 2004	T. granulatus 126 x 27 μm Koigakubo marsh Tessei-cho Okayama, 2006

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