Compare Meridion anceps
Meridion circulare and M. circulare var. constrictrum are asymmetric to the transapical axis.
The striae of Diatoma tenuis are less visible (higher stria density) and its costae are thinner and less silicified.
Meridion lineare has rounded ends.
LM scalebar = 10 µm
Length Range
10.4-65 µm
10.4-65 µm
Width Range
5.2-7.0 µm
5.2-7.0 µm
Striae in 10 µm
18-23
18-23
Length Range
12-55 µm
12-55 µm
Width Range
5-8 µm
5-8 µm
Striae in 10 µm
16-20
16-20
Length Range
17-80 µm
17-80 µm
Width Range
3-4 µm
3-4 µm
Length Range
20-85 µm
20-85 µm
Width Range
2.9-4.9 µm
2.9-4.9 µm
Striae in 10 µm
45-60
45-60
Length Range
11-31 µm
11-31 µm
Width Range
4.8-8.0 µm
4.8-8.0 µm
Striae in 10 µm
11-19, mostly 16-18
11-19, mostly 16-18
