Genus: Body more or less ovo-cylindrical; rigid with spirally striated pellicle; often with a short posterior spinous projection; stigma sometimes present; discoidal chromatophores (chloroplasts) numerous and marginal; paramylum bodies usually large and ring-shaped, laterally disposed; without pyrenoids; fresh water (Kudo, 1966).
Species: Body 20-40 μm long (Kudo, 1966). Ovoid with short anterior process and a longer posterior spine; fresh water (How to know the protozoa, 1979).

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L. ovum var. buetschlii 27 x 18 μm Watarase Wetland Fujioka Tochigi, 2005	L. ovum var. buetschlii ? 22 x 17 μm Tochigi, 2001	L. ovum 28 x 19 μm Watarase Wetland Fujioka Tochigi, 2005
L. ovum var. buetschlii μm Nishi-Urawa Saitama, 2003	L. ovum var. buetschlii ? 32 x 18 μm Mihashi Park Saitama, 2002	L. ovum var. buetschlii ? 26 x 18 μm near Shinrin-koen Namegawa Saitama, 2006	L. ovum var. buetschlii ? 29 x 21 μm Tokyo, 2001
L. ovum var. buetschlii ? 32 x 23 μm Iyari marsh 1 Omachi Nagano, 2007	L. ovum var. buetschlii ? μm Iyari marsh 3 Omachi Nagano, 2008	L. ovum var. buetschlii ? 30 x 20 μm near Oyomi marsh Hakuba Nagano, 2004	L. ovum var. buetschlii 25 x 15 μm Ushidome-ike Norikura highland Nagano, 2005
L. ovum var. buetschlii μm Japan, 199? by H. Yoshino
L. ovum ? striae thick 35 x 24 μm near Town Hall Shobu Saitama, 2004	L. ovum ? striae thick 34 x 20 μm Kumano park Higashi-Murayama Tokyo, 2004	L. ovum var. ??? μm Naruto Chiba, 2003	L. ovum μm near Yoshino p. Mitsukaido Ibaraki, 2006
L. ovum 17 x 12 μm near Town Hall Shobu Saitama, 2004	L. ovum 19 x 11 μm Izumi 741 Namegawa Saitama, 2004	L. ovum 20 x 20 μm Imou bog Toyohashi Aichi, 2004
L. ovum var. conica 31 μm Japan, 199? by H. Yoshino	L. ovum var. ? 59 μm Japan, 199?	L. ovum var. globula ? 37 μm Saitama, 1999	L. ovum var. globula ? 39 μm Uruguay, 1999
L. ovum var. ??? 32 x 23 μm Sakitama-kofun p. Gyoda Saitama, 2004	L. ovum 31 x 23 μm Shiba river near Owada Park Saitama, 2005	L. ovum ? or L. salina ? 31 x 23 μm Okubo Ryoke Akigase park Saitama, 2005

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