Eunotia bilunaris is similar in shape and size, but has less arched, often clearly tapering valves with acutely rounded apices. Valves of E. naegelii are narrow from the center toward the apices, have a smaller width and higher stria density. Eunotia mucophila has a similar valve outline, but is usually less silicified, appears more delicate, has narrower valves, higher stria density and raphe ends that are difficult to see in LM. Eunotia juettnerae has clearly tapered valves from the center toward the apices. It is not thought to occur in North America. Eunotia cantonatii, so far observed only in Europe, is similar in shape, but possesses clearly tapered ends and a single, apical hollow protrusion (sometimes visible in LM).

LM scalebar = 10 µm
Eunotia panda LM1 Eunotia panda LM2 Eunotia panda LM3 Eunotia panda LM4 Eunotia panda LM5 Eunotia panda LM6 Eunotia panda LM7
Length Range
32–97 µm
Width Range
3–4 µm
Striae in 10 µm
14.5–17 (up to 21 near the apices)

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

Eunotia naegelii

Mig. 1907

Eunotia Naegelii Long I Eunotia Naegelii Long Ii Eunotia Naegelii Long Iii Eunotia Naegelii Mid Eunotia Naegelii Girdle Eunotia Naegelii Short Ii Eunotia Naegelii Short
Length Range
42-180 µm
Width Range
2.5-3.5 µm
Striae in 10 µm
14-17 in the center, 16-22 at the ends

Eunotia mucophila

(Lange-Bert., Nörpel-Schempp and Alles) Lange-Bert. in Metzeltin et al. 2005

Eunotia 170 078A A  Ss Eunotia 241 073 A  Ss Eunotia Flexuosa 4 068B A  Ss Eunotia 63 076B C  Ss Eunotia 50 076B C  Ss Eunotia 99 081B B  Ss Eunotia 155 080B A  Ss
Length Range
18–52 µm
Width Range
1.9–2.3 µm
Striae in 10 µm

Also compare to

Eunotia juettnerae

Lange-Bert. in Lange-Bert. et al. 2011

Eunotia cantonatii

Lange-Bert. and Tagliaventi in Lange-Bert. et al. 2011