Compare Placoneis amphibola
Compare
Placoneis gastrum is smaller, with broader apices and finer areola density (24-27 in 10 µm). Placoneis abiskoensis has parallel sides and capitate apices. Rexlowea navicularis has more linear-lanceolate valves, an oval central area and finer stria and areola density.
LM scalebar = 10 µm
Length Range
39-66 µm
39-66 µm
Width Range
21.6-25.6 µm
21.6-25.6 µm
Striae in 10 µm
5.5-8.5
5.5-8.5
Placoneis gastrum
Length Range
30.2-55.8 µm
30.2-55.8 µm
Width Range
15.9-20.0 µm
15.9-20.0 µm
Striae in 10 µm
7-9 near the center, up to 10 near the apices
7-9 near the center, up to 10 near the apices
Rexlowea navicularis
Length Range
44–132 µm
44–132 µm
Width Range
18–30 µm
18–30 µm
Striae in 10 µm
5–6 in the center, 20 at the apices
5–6 in the center, 20 at the apices