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).
Species:

S. teres straight flagellum tapered at both ends cell 18 x 8 μm fl. 20 μm Kawagoe Saitama, 2002	S. teres straight flagellum tapered at both ends cell 20 x 8 μm fl. 27 μm Japan, 1998	S. teres straight flagellum tapered at both ends cell 23 x 9 μm fl. 20 μm Japan, 1999	S. teres straight flagellum tapered at both ends cell 18 x 8 μm fl. 20 μm Saitama, 1999
S. teres straight flagellum tapered at both ends cell 22 x 7 μm fl. μm Tachikawa Tokyo, 2004	S. teres straight flagellum tapered at both ends cell 23 x 6 μm Shiba river near Owada Park Saitama, 2005	S. teres cell 21 x 8 μm General Athletic p. Utsunomiya Tochigi, 2007	S. teres cell 24 x 8.5 μm Kitamoto N.O.P. Kitamoto Saitama, 2007

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