Compare

Eunotia exigua valves have a more concave ventral margin, and are more distinctly constricted near the apices than E. enishna and E. cataractarum. Eunotia exigua valves are also broader than E. enischna. The shoulders of E. exigua are more steeply sloped than the more gradual shoulder slopes of E. cataractarum. The dorsal margin of E. exigua is not distinctly straight as in E. orthohedra. Valves of E. exigua do not have parallel margins as in E. tenella, and the striae of E. exigua are more dense than in E. tenella. The dorsal margin of E. exigua valves is slightly flattened and is less convex relative to the ventral margin in contrast with the dorsal margin of E. meisteri, which is more or less more rounded and is more strongly convex relative to the ventral margin.

LM scalebar = 10 µm
Eunotia exigua LM5 Eunotia exigua LM6 Eunotia exigua LM4 Eunotia Smokies 1 Eunotia exigua LM3 Eunotia exigua LM2 Eunotia exigua LM1
Length Range
7.5-22 µm
Width Range
1.8-3.2 µm
Striae in 10 µm
16-24 in the center, 20-24 at the ends

Eunotia cataractarum

Furey, Lowe and Johansen 2011

Eunotia cataractarum LM5 Eunotia cataractarum LM6 Eunotia cataractarum LM1 Eunotia cataractarum LM4 Eunotia cataractarum LM3 Eunotia cataractarum LM2 Eunotia cataractarum LM7
Length Range
11-21 µm
Width Range
3.1-3.9 µm
Striae in 10 µm
15-20 in the center valve, 16-19 at the ends, puncta 44-50

Eunotia enischna

Furey, Lowe and Johansen 2011

Eunotia enischna LM7 Eunotia enischna LM4 Eunotia enischna LM5 Eunotia enischna LM3 Eunotia enischna LM6 Eunotia enischna LM1 Eunotia enischna LM2
Length Range
15-19 µm
Width Range
2.4-2.6 µm
Striae in 10 µm
23-24 in the center valve, 24-25 at the ends

Eunotia orthohedra

Furey, Lowe and Johansen 2011

Eunotia orthohedra LM3 Eunotia orthohedra LM5 Eunotia orthohedra LM4 Eunotia orthohedra LM1 Eunotia orthohedra LM2
Length Range
12-19 µm
Width Range
2.7-3.8 µm
Striae in 10 µm
16-20 in the valve center, 20-22 at the ends

Eunotia tenella

(Grunow) Hust. in A.Schmidt et al. 1913

Eunotial tenella LM7 Eunotial tenella LM2 Eunotial tenella LM6 Eunotial tenella LM5 Eunotial tenella LM1 Eunotial tenella LM4 Eunotial tenella LM3
Length Range
11-33 µm
Width Range
2.6-3.7 µm
Striae in 10 µm
16-22

Also compare to

Eunotia meisteri

Hust.