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). Chloroplasts small disc-shaped, without pyrenoids (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).
Species:

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L. marssonii var. marssonii cell 37 μm Mihashi Park Saitama, 2002	L. marssonii var. marssonii cell 37 x 12 μm Sakitama-kofun p. Gyoda Saitama, 2004	L. marssonii var. marssonii cell 35 x 13 μm water reservoir near Yamaguchi Univ. Yamaguchi, 2004	L. marssonii 29 x 7 μm Japan, 199?
L. marssonii 28 x 11 μm near Nan-ko Shirakawa Fukushima, 2003	L. marssonii 38 x 11 μm Higusa-numa Hikari Chiba, 2003	L. marssonii L. ovum ? 24-28 x 12-17 μ Kahan Park Kuroiso Tochigi, 2003	L. marssonii L. ovum ? 36 x 11 μ Nanbata castle p. Fujimi Saitama, 2005
L. marssonii 38 x 10 μm Izumo Shrine Izumo Shimane, 2006

Similar species --> L. wangi; L. steinii; L. teres;

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