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Chlorophyceae: Zygnematales: Mesotaeniaceae or Gonatozygaceae
(Gamophyceae: Zygnematales: Desmidiaceae)

Gonatozygon
de Bary

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

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Gonatozygon Gonatozygon
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