Compare Frustulia krammeri
Compare
Frustulia krammeri is generally much larger and has less dense, more wavy striae than F. inculta. Frustulia krammeri has striae that do not circumradiate the apices, while the striae of F. amphipleuroides, F. rexii and F. saxonica do circumradiate the apices. The porte-crayon and distal portion of the longitudinal ribs are more slender in F. krammeri than in F. rexii. Frustulia krammeri has much less noticeably undulate margins and less protracted apices than F. quadrisinuata. Frustulia krammeri has a much lower stria density than F. saxonica (30-33 in 10 µm).
LM scalebar = 10 µm
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 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 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 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