Compare Frustulia rexii
Compare
Frustulia rexii has striae that circumradiate the apices, while such striae are absent in F. krammeri. The very robust distal longitudinal ribs and porte-crayon structure in F. rexii are not present in F. inculta and F. krammeri. In addition, F. inculta lacks the group of poroids in the central area. F. rexii has much less noticeably undulate margins and protracted apices than F. quadrisinuata. F. rexii has valves that are generally more robust than those of F. saxonica, with more broadly rounded apices, thicker longitudinal ribs, and a larger porte-crayon.
LM scalebar = 10 µm
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 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
