Family: Filamentous algae without branching; cell body cylindrical; chloroplasts band-, plate- or star-shaped (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Filament without branching; cell body cylindrical; one or several chloroplasts band-shaped, spirally arranged within the cell, pyrenoids present; septum with or without folded structure (Guide book to the "Photomicrographs of the Freshwater Algae", 1998). About 300 species (Illustrations of The Japanese Fresh-water Algae, 1977).

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More than 100 μm diam. (17 samples)
S. margaritata x μm chl. Toneri Park Tokyo, 2001	S. margaritata x 144-148 μm 14 chl. Kurihashi Saitama, 2001	S. setiformis 3 chl. 3.5 turns x 108 μm Saitama, 2001	S. setiformis 3 chl. 3.5 turns x 108 μm Saitama, 2001
50-100 μm diam. (40 samples)
S. ternata 3 chl. 1.5-3 turns radiate nuc. 69-88 μm diam. 1997-99	S. majuscula 6 chl. 1.5 turns gelatinous sheath 75 μm diam. Saitama, 2000	S. sp.02 4 chl. 2 turns x 58 μm Chiba, 2000	S. distenta 2 chl. 2-2.5 turns spherical nuc. 112 x 53 μm 1998-2001
25-50 μm diam. (93 samples)
S. sp.13 4 or 6 chl. disc-like nuc. 475 x 48 μm 1998	S. porticalis 1 chl. spherical nuc. 36-40 μm diam. 1997-99	S. sp.20 3 chl. conjugation 35 μm diam. 1998-2001	S. varians 1 chloplast disc-like nuc. 35 μm diam. 2000-2006
Less than 25 μm diam. (40 samples)
S. sp.17 1 chl. spherical ? nuc. 24-26 μm diam. 1998-2000	S. sp.7 4 chl. 3-4 turns ovoid nuc. 25 μm 1998-99	S. sp.1 1 chl. 5 turns 125 x 16 μm Tochigi, 2001	S. sp. 1 chl. turns x 12 μm Showa Memorial p. Tokyo, 2001
Septum folded: (27 samples)
Spirogyra sp. 1 chl. 6.5 turns x 28 μm Saitama, 2001	S. arta ? 6 samples 1 chl. 8 turns spherical nuc. x 19-20 μm 1998-2006	S. tenuissima 6 samples 1 chl. 4-9 turns x 14-15 μm 1998-2006	Spirogyra sp. 1 chl. turns x 12 μm Shikinawa-ike Fukuoka, 2001
???
Spirogyra sp. or Mougeotia ? Japan, 1998 Movies

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