Compare Frustulia asiatica
Compare
Frustulia asiatica is distinguished from F. vulgaris by its narrower valves and less protracted apices. In addition, the small, irregular poroids adjacent to the raphe in F. asiatica (visible only with SEM) have not yet been observed in US populations of F. vulgaris.
LM scalebar = 10 µm
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
Frustulia vulgaris
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