M. pussillum cells 9-11 μm diam. spines ~44 μm S/L=4.0 Japan, 1997	M. pussillum cells 7-8 μm diam. spines ~47 μm S/L=5.9 long spines only Yamagata, 1999	M. pussillum cells 7 μm diam. spines ~24 μm S/L=3.4 long & short spines Japan, 1998	Micractinium sp. cells 8 μm diam. spines ~25 μm S/L=3.1 Mishima Shizuoka, 2001
M. pussillum cells 5-9 μm diam. spines ~43 μm S/L=4.8 Uruguay, 1999	M. pussillum cells 5-8 μm diam. spines ~30 μm S/L=3.8 Hiroshima, 1998 Movies	M. pussillum cells 5-8 μm diam. spines μm Namegawa Saitama, 2004	M. pussillum cells 5 μm diam. spines ~41 μm S/L=8.2 Saitama, 1999
M. pussillum cells 6-9 μm diam. spines ~35 μm S/L=3.9 Kurobane Tochigi, 2001	M. pussillum cells 7 μm diam. spines ~27 μm S/L=3.9 Urawa Saitama, 2001	M. pussillum cells 8 μm diam. spines ~37 μm S/L=5.3 Urawa Saitama, 2001	M. pussillum cells 7 μm diam. spines ~44 μm S/L=6.3 Koshigaya Saitama, 2001
M. pussillum cells μm diam. spines μm Showa-machi G.P. Showa Saitama, 2003	M. pussillum cells 10 μm diam. spines 40 μm kenko-fukushi m.p. Koshigaya Saitama, 2005	M. pussillum cells 6-11 μm diam. spines 60 μm kenko-fukushi m.p. Koshigaya Saitama, 2006	M. pussillum cells 5-8 μm diam. spines 17 μm Shinrin-koen Namegawa Saitama, 2005
M. pussillum cells 8 μm diam. Nakayado h.p. Fukaya Saitama, 2006	Micractinium sp. cells μm diam. spines μm O-ike park Yabuki Fukushima, 2003	Micractinium sp. cells 6 μm diam. spines 35 μm Shide-numa Kita-kawabe Saitama, 2005	Micractinium sp. cells μm diam. spines μm O-ike park Yabuki Fukushima, 2003
Micractinium sp. cells 6 μm diam. spines ~20 μm S/L=3.3 Tatabayashi Gunma, 2001	Micractinium sp. cells μm diam. spines ~ μm S/L= Japan, 2000	Micractinium sp. cells 6 μm diam. spines ~33 μm S/L=5.5 Abiko Chiba, 2000	Micractinium sp. cells 6 μm diam. spines ~21 μm S/L=3.5 Koshigaya Saitama, 2001
Micractinium sp. cells 5 μm diam. spines ~11 μm S/L=2.2 Ueno Tokyo, 2001	Micractinium sp. cells 7 μm diam. spines ~31 μm S/L=4.4 Ueno Tokyo, 2001	Micractinium sp. ? cells 6 x 3-4.5 μm spines ~27 μm S/L=4.5 Saitama, 1999	Micractinium sp. ? cells 8 x 4 μm spines ~26 μm S/L=3.2 Koshigaya Saitama, 2001
Micractinium sp. ? cells μm spines μm S/L= Kodama town Saitama, 2003	Micractinium sp. cells 6 μm spines 13 μm Jionji-shinsui p. Iwatsuki-ku Saitama, 2006	Micractinium sp. cells μm spines μm Old Sugata r. Mibu Tochigi, 2008	Micractinium sp. cells μm spines μm Kashiwa v.m.p. Kashiwa Chiba, 2008
Micractinium sp. ?? cells 2 μm diam. Dictyosphaerium ? Abiko Chiba, 2000

Similar genus --> Golenkinia; Franceia; Acanthosphaera;

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