Family: Unicells; cell wall present; two flagella (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Similar to Chlamydomonas, but pyrenoids absent.
Cell body ellipsoidal, spherical, ovoid, cylindrical, or spindle-shaped; cellwall thin or thick; papilla present/absent; two flagella emerging from one point; chloroplast essentially cup-shaped or bowl-shaped, in some cases, showing various shapes; pyrenoids absent; stigma present/absent; nucleus mostly located at the center of the cell; two or rarely one contractile vacoules apical (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).

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Cell body spherical or nearly spherical
C. tenebraria ? 8 samples cell 11-19 μm flag. μm papilla present 1998-2005 Movies	C. tenebraria ? papilla present cell μm flag. μm Daidarabotchi-ike Iizuna-kogen Nagano, 2003	Chloromonas sp. 15 x 14 μm Takao Sakura p. Kitamoto Saitama, 2005	Chloromonas sp. 18 x 16 μm Yoshigadaira m. Shirane mountain Gunma, 2005
C. porosa cell 17-22 μm φ flag. μm papilla present Tokyo, 2001	C. ulla cell 22 μm φ flag. μm Nishi-Urawa Saitama, 2003	C. ulla ? cell 18 μm φ flag. μm Tsuchiura Ibaraki, 2003	Chloromonas sp. or Chlamydomonas ? 19 x 17 μm stock Tisk-2 Kamigo ni-ku Ishibashi Tochigi, 2004
C. ulla cell 12-23 μm φ near Yoshigadaira m. Shirane mountain Gunma, 2005	C. ulla cell 19-23 μm φ Iroha-numa Zao mountain Yamagata, 2005	C. ulla cell 22 x 20 μm Oura central p. Oura Gunma, 2006	C. ulla ? cell 24 x 21 μm Shiroyama Park Okegawa Saitama, 2006
Cell body ovoid or ellipsoidal
C. vesterbottnica ? 20 x 19 μm near Takao-sakura p. Kitamoto Saitama, 2005	C. vulgaris ? 8 samples nuc. anterior cell 11-19 μm flag. 24 μm 2002-2006	Chloromonas sp. C. vulgaris ? nuc. central cell 12.5 x 9 μm flag. μm Yoshimi Saitama, 2003	Chloromonas sp. C. vulgaris ? nuc. central cell 13 x 10 μm flag. μm Kasukabe Saitama, 2004
C. rodhei ? papilla present cell 13.5-20 μm flag. μm Shimo-takatsu Tsuchiura Ibaraki, 2003	C. hypolimnica ? & stock Smn-1 & 2 5 samples nuc. central cell μm Nishikubo damp area Iruma Saitama, 2003	Chloromonas sp. nuc. central cell μm Mizuko Fujimi Saitama, 2003	C. infirma nuc. central cell 15 x 9 μm flag. μm Nishi-Urawa Saitama, 2003
C. bichlora 15 x 8 μm Miyadera Iruma Saitama, 2003	Chloromonas sp. or Chlamydomonas ? cell 28 x 24 μm flag. μm Iruma Saitama, 2003	C. nasus ? cell 20 x 14 μm flag. 10 μm Furu-tone river Kasukabe Saitama, 2004	C. dahlemensis 13-17 x 9-10 μm flag. 15 μm nature obs. p. Kitamoto Saitama, 2005
C. dahlemensis cell division 16 x 8.5 μm nature obs. p. Kitamoto Saitama, 2005	Chloromonas sp. 19 x 17 μm Jizoh-bori Sannoh Park Saitama, 2005
Cell body pear-shaped or cylindrical
C. excentrica ? cell 13 x 7 μm flag. μm Mizutori-no-Sato Kawagoe Saitama, 2006	C. flos-aquae ? cell 9.5 x 5.5 μm flag. μm Kamigo ni-ku Ishibashi Tochigi, 2004	Chloromonas sp. 25 x 9 μm Kowashimizu Suwa Nagano, 2005

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