Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Trichome blue-green in color, nearly straight or slightly curved, both ends slightly tapered and slightly curved, without constriction at cell-cell junction, 10-17 μm wide (cf. O. limosa, 15-20 μm); cell body short in length, 2-5 μm long (1/6-1/3 (0.16-0.33) of its width); sometimes with granules along septum; terminal cells rounded with flattened apex (Illustrations of The Japanese Fresh-water Algae, 1977).

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O. curviceps ? 3? x 13 μm L/W=0.2 Ukishima marsh Tsugaike highland Nagano, 2005	O. curviceps 12.5 μm φ L/W=0.2-0.36 Kabuto-yama Nishi-no-miya Hyogo, 2004	O. curviceps ? 1.5-3 x 12 μm L/W=0.13-0.25 Izumi 741 Namegawa Saitama, 2004	O. curviceps ? 3.5 x 12 μm L/W=0.21 Izumi 741 Namegawa Saitama, 2004
O. curviceps 11.5 μm φ L/W=0.26 Saitama studium Saitama Saitama, 2006	O. curviceps 11.5 μm φ L/W=0.26 Kurome river Asaka Saitama, 2005	O. curviceps ? 11 μm φ L/W=0.3-0.5 Furu-tone river Kasukabe Saitama, 2004	O. curviceps ? 11 μm φ L/W=0.18-0.32 Tsuki river Ranzan Saitama, 2003
O. curviceps ? 2-3 x 10 μm φ L/W=0.2-0.3 Mizuko Fujimi Saitama, 2003	O. curviceps ? 2-3 x 10.5 μm L/W=0.2-0.3 Watasuge marsh Tsugaike highland Nagano, 2005	O. curviceps ? 2 x 10.5 μm L/W=0.2 Gozaisho marsh Hachimantai Iwate, 2005

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