Genus: Two flagella with unequal length emerging from anterior canal, longer one directed anteriorly and held straight during swimming, shorter one curving laterally; cell body colorless, no eyespot, rigid, solitary, cylindrical, usually unflattened, one or more longitudinal lines or grooves present; hyaline inclusion in posterior half of the cell; freshwater and marine (Illustrated guide, 1985).
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S. teres
6 samples
straight flagellum
both ends pointed
18-23 μm
Japan, 1998-2005
