Eunotia charliereimeri also has two rimoportulae per valve but is broader, more coarsely striate, more curved, and with parallel margins in large valves. Other comparable taxa do not have two rimoportulae per valve. Eunotia bilunaris is narrower and more finely striated. Eunotia incisa is generally smaller and has a nearly straight ventral margin. Eunotia pirla and Eunotia carolina also have nearly straight ventral margins.

LM scalebar = 10 µm
Eunotia sarraceniae LM7 Eunotia sarraceniae LM6 Eunotia sarraceniae LM5 Eunotia sarraceniae LM4 Eunotia sarraceniae LM3 Eunotia sarraceniae LM2 Eunotia sarraceniae LM1
Length Range
21.3-66.1 µm
Width Range
3.9-5.9 µm
Striae in 10 µm

Eunotia charliereimeri

Edlund and L.A.Brant 2010

Eunotia charliereimeri LM2 Eunotia charliereimeri LM1 908 45 4  Eun Cwr 808 40 4  Eun Cwr 621 31 1  Eun Cwr Eunotia charliereimeri LM3
Length Range
23.4-71.7 µm
Width Range
4.9-6.7 µm
Striae in 10 µm

Eunotia incisa

W.Sm. ex W.Greg. 1854

Eunotia incisa LM6 Eunotia incisa LM5 Eunotia incisa LM4 Eunotia incisa LM3 Eunotia incisa LM2 Eunotia incisa LM1 Eunotia incisa LM7
Length Range
12-50 µm
Width Range
2.8-5.0 µm
Striae in 10 µm
16-21 in the center valve

Eunotia bilunaris

(Ehrenb.) Schaarschm. 1881

Eu Bilun 1 Eubilun 8 Eu Bilun 3 Eu Bilun 4 Eu Bilun 5 Eu Bilun 6 Eu Bilun 7
Length Range
33–110 µm
Width Range
3.1–4.7 µm
Striae in 10 µm
11–16 at center of the valve, 15–19 near the apices

Also compare to

Eunotia pirla

J.R.Carter and Flower

Eunotia carolina