Genus: Cell body flat, large, variable in shape, longer than wide; strong constriction at center; each semicell with several notches; cell wall with many short spines (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: 102-129 μm long, 84-124 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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M. crux-melitensis v. crux-melintensis 188 x 150 μm Hiroshima, 1998 Movies	M. crux-melitensis v. crux-melintensis or M. radiata ? 141 x 119 μm USA, 1999	M. crux-melitensis v. crux-melitensis 125 x 98 μm Higashi-sano Hakuba Nagano, 2004	M. crux-melitensis v. crux-melitensis 118 x 90 μm 100 x 87 μm near Oyomi marsh Hakuba Nagano, 2004
M. crux-melitensis v. crux-melitensis 115 x 100 μm Toneri Park Tokyo, 2001	M. crux-melitensis v. crux-melitensis 86 x 86 μm Kuroiso Tochigi, 1998 Movies	M. crux-melitensis v. crux-melitensis 140 x 108 μm 136 x 109 μm Yamaguchi Univ. Yamaguchi, 2004	M. crux-melitensis v. crux-melitensis 160* x 120 μm Furuike marsh Togakushi highland Nagano, 2006
M. crux-melitensis v. crux-melitensis 130 x 108 μm Higusa-numa Hikari Chiba, 2006
M. crux-melitensis v. superflua 151 x 131 μm Uruguay, 1999	M. crux-melitensis v. superflua 119 x 109 μm Toneri Park Tokyo, 2001	M. crux-melitensis stock ??? cell division Toneri Park Tokyo, 2001	M. crux-melitensis v. superflua 114 x 105 μm Sendabori Chiba, 2002
M. crux-melitensis v. superflua stock Hsf-51 μm Sanda Hyogo, 2001

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