Family [Gonatozygaceae]: Cell body cylindrical, slightly swelled at both ends, loosely attached with each other to form a filament; cell wall consists of a single partition, two layers, with small pores, covered with dots, granules or short spines; chloroplast ribbon-like, with many aligned pyrenoids.
Genus: Two chloroplasts plate-like or slightly spiralled; a nucleus centrally located between the chloroplasts; mostly unicells, filaments rare (Illustrations of The Japanese Fresh-water Algae, 1977).

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Cell body cylindrical, L/W=14-25, cellwall smooth, both ends truncated, 2 chloroplasts
G. kinahanii 270 x 15 μm L/W=18 water reservoir near Yamaguchi Univ. Yamaguchi, 2004	G. kinahanii 245 x 15 μm L/W=16.3 Shiba river near Owada Park Saitama, 2005	G. kinahanii 265 x 14 μm L/W=18.9 Omine-numa Minakami Gunma, 2006	G. kinahanii μm L/W= Takao Sakura p. Kitamoto Saitama, 2008
G. kinahanii 250 x 14 μm L/W= Igashira park Mooka Tochigi, 2006	G. kinahanii μm L/W= Igashira park Mooka Tochigi, 2008	G. kinahanii μm L/W= Kashiwa-no-ha p. Kashiwa Chiba, 2008
G. kinahanii x 13 μm L/W= Shinagawa Tokyo, 2003	G. kinahanii ? 515 x 11 μm L/W= 46.8 Asaka Saitama, 2000	G. kinahanii 196 x 12 μm L/W= 16.3 Asaka Saitama, 2000	G. kinahanii 134 x 12 μm L/W= 11.2 Hiroshima, 1998 Movies
G. kinahanii x 12 μm L/W= Ina Saitama, 2003	G. kinahanii 310 x 10 μm 215 x 11 μm water reservoir near Yamaguchi Univ. Yamaguchi, 2004	G. kinahanii 330 x 16 μm Ohnuma Nasu-shiobara Tochigi, 2007
Cell body cylindrical, L/W=10-25, cellwall granulated, both ends slightly swelled
G. monotaenium 145 x 11 μm L/W= 13.2 c.w. granulated Nanbata-shinden Fujimi Saitama, 2004
Cell body cylindrical, L/W=12-20, cellwall covered with hairly spines, both ends truncated (or slightly swelled)
G. pilosum var. pilosum 152 x 10 μm L/W= 15.2 c.w. hairly Kurihashi Saitama, 2001	G. pilosum var. pilosum 143 x 10 μm L/W= c.w. hairly Kurihashi Saitama, 2001	G. pilosum var. pilosum 95, 105 x 11 μm Kejo-numa 1 Osaki Miyagi, 2006	G. pilosum var. pilosum x 10 μm waterfield Nagano, 2007
G. pilosum var. echinatum or G. aculeatum ? 80 x 5.5 μm L/W= 14.5 c.w. hairly Hiroshima, 1998	G. aculeatum var. aculeatum 181 x 4.7 μm L/W= 38.5 c.w. hairly Uruguay, 1999
Cell body elongated spindle-shaped, L/W=10-16, cellwall granulated, both ends swelled
G. brebissonii 225 x 8 μm L/W= 28.1 Senuki Nasu Tochigi, 2004	G. brebissonii 182 x 9 μm L/W= 20.2 Senuki Nasu Tochigi, 2004	G. brebissonii 180 x 6.5 μm L/W= 27.7 Higashi-sano Hakuba Nagano, 2004	G. brebissonii 107 x 6 μm L/W= 17.8 Shimo-muneoka Shiki Saitama, 2004
G. brebissonii 120 x 6.5 μm L/W= 18.4 Koigakubo marsh Tessei-cho Okayama, 2004	G. brebissonii 110 x 8 μm L/W= 13.8 Satsunai river Obihiro Hokkaido, 2005	G. brebissonii 141 x 6.5 μm L/W= 21.7 Azami-ike Norikura highland Nagano, 2006	G. brebissonii x μm L/W= Nabekura highland Iiyama Nagano, 2008
G. brebissonii 149 x 6.5 μm L/W= Naruto-Togane Sanmu Chiba, 2006	G. brebissonii μm rice field Omachi Nagano, 2008	G. brebissonii 85-144 x 6 μm near Omine mt. Minakami Gunma, 2007	G. brebissonii x 6 μm near Omine mt. Minakami Gunma, 2008
Gonatozygon or Mougeotia ?
Gonatozygon sp. x 19 μm L/W= Kiyose Tokyo, 2003

Similar genus -->> Mougeotia;

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