Cyclotella choctawhatcheeana is very similar; both taxa are ornamented on one side of the tangential undulation. Cyclotella choctawhatcheeana is larger and has a higher stria density. Cyclotella ambigua and C. baltica are colliculate across the valve center. Cyclotella distinguenda and C. gamma are both tangentially undulate, but both lack ornamentation in the central valve.

LM scalebar = 10 µm
Cymichi 1 Cymich 2 Cymich 3 Cymich 4 Cymich 5 Cymich 6 Cymich 7
7.5-14 µm
Width Range
5.5-14 µm
Striae in 10 µm
15-17 based on circumferential density

Cyclotella distinguenda

Hust. 1927

Cdis29 2 Cdis22 9 Cdis22 9B Cdis19 6 Cdis12 7 Cdis11 8B Cdis9 6
7.4-21.9 µm
Striae in 10 µm
12.5-14.7 (by circumference)

Cyclotella gamma

Sovereign 1963

Cyclotella Gamma 1 Cyclotella Gamma 2 Cyclotella Gamma 4 Cyclotella Gamma 5 Cyclotella Gamma 6 Cyclotella Gamma 7
18.1-48.2 µm
Striae in 10 µm

Also compare to

Cyclotella ambigua

Grunow in Cleve and Grunow

Cyclotella baltica

(Grunow) Håk.

Cyclotella choctawhatcheeana