Compare Frustulia saxonica
Compare
Frustulia saxonica is generally less robust than F. rexii, with finer valves, more narrowly rounded apices, thinner longitudinal ribs and a smaller porte-crayon. Frustulia saxonica has much more narrowly rounded apices than F. quadrisinuata, and its margins are not undulate, as the margins of F. quadrisinuata. The striae of F. saxonica are radiate at the apices, while the striae of F. krammeri and F. inculta are not radiate. Frustulia saxonica has a much higher stria density than that of F. krammeri (24-26 in 10 microns). Frustulia saxonica has relatively shorter helictoglossae than F. inculta, so that the porte-crayon appears smaller in F. saxonica.
LM scalebar = 10 µm
Length Range
46.5-87.5 µm
46.5-87.5 µm
Width Range
12.5-17.5 µm
12.5-17.5 µm
Striae in 10 µm
30-33
30-33
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 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