Diatoms of North AmericaDiatoms of North America
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Compare Tetracyclus emarginatus

(Ehrenb.) W.Smith 1856

Compare

Tetracyclus glans has a central inflation that lacks notches and the valve apices are pointed.

Tetracyclus cruciformis has a central inflation that lacks notches and the valve apices are capitate to prominently wedge-shaped.

LM scalebar = 10 µm
Tetracyclus emarginatus LM4 Tetracyclus emarginatus LM3 Tetracyclus emarginatus LM6 Tetracyclus emarginatus LM5 Tetracyclus emarginatus LM2 Tetracyclus emarginatus LM1
Length Range
18.8-37.3 µm
Width Range
13.1-19.4 µm
Striae in 10 µm
18-24

Tetracyclus glans

(Ehrenberg) Mills 1935

Iwb 0030 1 Tetracyclus Glans 001 Girdle Band Cropped Small Iwb 0026 1 Tglans 009 Cropped Adjusted Small Iwb 0026 1 Tglans 004 Cropped Adjusted Small Iwb 0026 1 Tglans 005 Cropped Adjusted Small Cas 183038 07282014 051 Adj Cropped Small Cas 183038 07282014 028 Test
Length Range
19.4-37.5 µm
Width Range
13-21 µm
Striae in 10 µm
21-23

Also compare to

Tetracyclus cruciformis

G.W.Andrews 1970