Smaller specimens of E. nymanniana may appear similar to larger specimens of E. exigua and E. tenella, several specimens may need to be observed for identification. Note that the upper size for E. nymanniana is greater. The dorsal and ventral margins of E. nymanniana are similar in shape and equally spaced. In contrast, the dorsal margin of E. exigua slopes, forming a 'shoulder' toward the apices. Eunotia nymanniana valves are more curved than those of E. tenella and E. neocompacta. Eunotia nymanniana valves are not as strongly arched and the distal raphe end does not curve as far on to the valve face as in E. elegans.

LM scalebar = 10 µm
Eunotia nymanniana LM7 Eunotia nymanniana LM6 Eunotia nymanniana LM5 Eunotia nymanniana LM4 Eunotia nymanniana LM3 Eunotia nymanniana LM2 Eunotia nymanniana LM1
Length Range
14.5-47.5 µm
Width Range
2.2-3.7 µm
Striae in 10 µm
18-22 in the center valve, 20-24 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

Eunotia exigua

(Bréb. in Kütz.) Rabenh. 1864

Eunotia exigua LM5 Eunotia exigua LM4 Eunotia exigua LM6 Eunotia exigua LM3 Eunotia Smokies 1 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

Also compare to

Eunotia elegans


Eunotia neocompacta