Compare Frustulia vulgaris
Compare
Frustulia vulgaris can be distinguished from F. asiatica by its more protracted apices and slightly rhomboid valve shape. The poroids that occur adjacent to the raphe in F. asiatica have not yet been observed in US populations of F. vulgaris. In addition, the valves of F. vulgaris are generally greater in length and width than those of F. asiatica.
LM scalebar = 10 µm
Length Range
51.7-57.5 µm
51.7-57.5 µm
Width Range
11.0-12.0 µm
11.0-12.0 µm
Striae in 10 µm
30-31 at the center, 32-34 at the ends
30-31 at the center, 32-34 at the ends
Frustulia asiatica
Length Range
42.5-48.5 µm
42.5-48.5 µm
Width Range
8.0-9.0 µm
8.0-9.0 µm
Striae in 10 µm
30-32 in the center valve, 34-35 at the ends
30-32 in the center valve, 34-35 at the ends