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Cymbella subcistula has a nearly filiform raphe, 2-5 stigmata and areola density of 19-24 in 10 µm. Cymbella dorsenotata has up to 6 stigmata, a cymbiform to lunate outline, and coarser areola density of 12-15 in 10 µm. Cymbella proxima has broader valves and lower areola density (12-15 in 10 µm). Cymbella blinni has smaller valves (<12 μm wide), higher areola density (22-30 in 10 μm), higher stria density (10-15 in 10 μm) and 1-5 stigmata.

LM scalebar = 10 µm
Cymbella Neocistula  L 4 33 2 Cymbella Neocistula  L 4 33 1 Cymbella Neocistula  L 4 33 3 Cymbella Neocistula  L 4 33 4 Cymbella Neocistula  L 4 33 6 Cymbella Neocistula  L 4 33 5
Length Range
32-85 µm
Width Range
11-22 µm
Striae in 10 µm
7-10 at valve center, 10-13 near ends

Cymbella proxima

Reimer in R.M.Patrick and Reimer 1975

Cymbella proxima LM6 Cymbella proxima LM5 Cymbella proxima LM2 Cymbella proxima LM4 Cymbella proxima LM1 Cymbella proxima LM3
Length Range
51-104 µm
Width Range
17.8-23.0 µm
Striae in 10 µm
7-8 in the center valve, up to 12 at the ends

Cymbella blinnii

L.L.Bahls 2014

Cymbella Blinnii1 Cymbella Sp 493501 2 Cymbella Blinnii3 Cymbella Blinnii4 Cymbella Blinnii5 Cymbella Blinnii6 Cymbella Blinnii7
Length Range
22.4-54.4 µm
Width Range
7.6-11.4 µm
Striae in 10 µm
10-14 at the valve center, 14-15 near the apices

Also compare to

Cymbella subcistula

Krammer

Cymbella dorsenotata

Østrup