Drawing

描述：

Notosolenus chelonides Skuja, 1939. Cells rigid, oval or broadly egg-shaped, flattened. The cells are 27-35 x 19-28 microns and 10-14 microns thick. Dorsal side strongly convex with 3-4 very strong, high longitudinal keels, which converge forward. Ventral side flat and concave, with an twisted longitudinal furrow. Anterior flagellum approximately cell length and posterior flagellum 0.5-0.6 times cell length. Cytoplasm hyaline, with rather large, round paramylon granules. Large nucleus in left-central part of the cell.