Genus: Cell body elongated spindle in shape, straight or curved, sharply pointed at both ends; (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Cell body elongated fusiform, tapering toward sharply pointed ends, 40-68 μm long, 2 μm wide; two chloroplasts parietal, extending into the both ends, without pyrenoids; cell division produces 2, 4, 8 or 16 "autospores" (Photomicrographs of the Freshwater Algae, 1996).

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Cell body thin, long: L/W > 20
M. griffithii 94 x 2.5 μm L/W=37 Nishi-Urawa Saitama, 2003	M. griffithii 93 x 3 μm L/W=31 Yoshimi Saitama, 2003	M. griffithii 66-101 μm L/W=29 Ueno Tokyo, 2001	M. griffithii 81 x 3 μm L/W=27 Japan, 1998
M. griffithii 80 x 3 μm L/W=27 Koriyama Fukushima, 2001	M. griffithii 72 x 3 μm L/W=24 Uruguay, 1999	M. griffithii 88 x 4 μm L/W=22 Japan, 1998	M. griffithii? 81 x 4 μm L/W=20 Japan, 1997
M. griffithii μm L/W= Yoshimi town Saitama, 2003	M. griffithii μm L/W= Chiba-Minato Park Chiba, 2003	M. griffithii μm L/W= Kodama town Saitama, 2003	M. griffithii 94 x 3 μm L/W= Watarase river Ashikaga Tochigi, 2004
M. griffithii 90 x 3 μm L/W=30 near Town Hall Shobu Saitama, 2004

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