Diatoms of North AmericaDiatoms of North America
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Compare Cylindrotheca gracilis

(Bréb. ex Kütz.) Grunow in Van Heurck 1882

Compare

The cells of Cylindrotheca closterium are lanceolate, with long, thin, flexible apices. The valves are not twisted. Cylindrotheca closterium is primarily a marine taxon.

While Nitzschia acicularis and N. draveillensis are also narrow and elongate, the valves are not twisted.

LM scalebar = 10 µm
Cylindrotheca gracilis LM3 Cylindrotheca gracilis LM1 Cylindrotheca gracilis LM2 Cylindrotheca gracilis LM1 Cylindrotheca gracilis LM3 Cylindrotheca gracilis LM2
Length Range
64-148 µm
Width Range
2.8-7.9 µm

Nitzschia acicularis

(Kütz.) W.Sm. 1853

Nitzschia acicularis LM3 Nitzschia acicularis LM1 Nitzschia acicularis LM2 Nitzschia acicularis LM4 Nitzschia acicularis LM5
Length Range
30.0-100.0 µm
Width Range
3.0-4.0 µm

Also compare to

Cylindrotheca closterium

BioData Reference
Krammer and Lange-Bertalot 2/2 Pl 87 Fig 1-2

Nitzschia draveillensis

M.Coste and Ricard

BioData Reference
Krammer and Lange-Bertalot 2/2 Pl 85 Fig 5-6