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Chamaepinnularia krookiformis is elliptic in shape.

Chamaepinnularia gandrupii is more linear in shape, lacking a central expansion.

Chamaepinnularia hassiaca is small and more linear in shape.

LM scalebar = 10 µm
Chamaepinularia krookii LM5 Chamaepinnularia krookii LM2 Chamaepinnularia krookii LM1 Chamaepinnularia krookii LM3 Chamaepinnularia krookii LM4 Chamaepinularia krookii LM6 Chamaepinularia krookii LM5
Length Range
18.8-22 µm
Width Range
4-5.1 µm
Striae in 10 µm
15-19

Chamaepinnularia gandrupii

(J.B.Petersen) Lange-Bert. and Krammer 1996

Chamaepinnularia gandrupii LM6 Chamaepinnularia gandrupii LM1 Chamaepinnularia gandrupii LM2 Chamaepinnularia gandrupii LM7 Chamaepinnularia gandrupii LM3 Chamaepinnularia gandrupii LM4 Chamaepinnularia gandrupii LM5
Length Range
13.4-19.8 µm
Width Range
2.6-3.4 µm
Striae in 10 µm
22-26

Chamaepinnularia hassiaca

(Krasske) Cantonati and Lange-Bert. 2009

Chamaepinnularia Hassiaca Me10020 A 042318 01 Csharpened Chamaepinnularia Hassiaca Me10020 A 102017 185 Csharpened Chamaepinnularia Hassiaca Cthp001 A 112117 37 Csharpened Chamaepinnularia Hassiaca Instaar15632 B 031517 02 Csharpened Chamaepinnularia Hassiaca Me10019 A 101817 106 Csharpened
Length Range
8.8-10.8 µm
Width Range
2.5-2.7 µm
Striae in 10 µm
20-25

Also compare to

Chamaepinnularia krookiformis

(Krammer) Lange-Bert. and Krammer