Compare Frustulia quadrisinuata
Compare
Frustulia quadrisinuata has more undulate margins and protracted apices than F. rexii, F. krammeri, F. amphipleuroides, and F. inculta. F. quadrisinuata has much more broadly rounded apices and robust valves than F. crassinervia. F. quadrisinuata has more broadly rounded apices and undulate valve margins than F. saxonica.
LM scalebar = 10 µm
Length Range
58.0-67.0 µm
58.0-67.0 µm
Width Range
14.0-15.0 µm
14.0-15.0 µm
Striae in 10 µm
30-31
30-31
Frustulia amphipleuroides
Length Range
63.0-97.0 µm
63.0-97.0 µm
Width Range
15.0-16.5 µm
15.0-16.5 µm
Striae in 10 µm
23-25 in the center, 25-26 at the ends
23-25 in the center, 25-26 at the ends
Frustulia krammeri
Length Range
68-119 µm
68-119 µm
Width Range
18-22 µm
18-22 µm
Striae in 10 µm
24-26 in the center, 24-25 at the ends
24-26 in the center, 24-25 at the ends
Frustulia inculta
Length Range
54-74 µm
54-74 µm
Width Range
11.5-14.0 µm
11.5-14.0 µm
Striae in 10 µm
28-30 in the center valve, 27-28 at the ends
28-30 in the center valve, 27-28 at the ends
Frustulia rexii
Length Range
68-111 µm
68-111 µm
Width Range
17.5-21.0 µm
17.5-21.0 µm
Striae in 10 µm
26–28 in the center, 28 at the ends
26–28 in the center, 28 at the ends
Frustulia crassinervia
Length Range
34.5-48.0 µm
34.5-48.0 µm
Width Range
9.0-10.5 µm
9.0-10.5 µm
Striae in 10 µm
33-35 in the center
33-35 in the center
