Diatoms of North AmericaDiatoms of North America
Return to overview

Compare Diatoma problematica

Lange-Bert. 1993

Compare

Diatoma moniliformis has smaller and more elliptical valves.

Diatoma tenuis has frustules biconcave in girdle view, and linear valves with capitate apices.

Diatom ehrenbergii is wider, with capitate to subcapitate apices.

LM scalebar = 10 µm
Diatoma problematica LM3 Diatoma problematica LM2 Diatoma problematica LM4 Diatoma problematica LM1 Diatoma problematica LM7 Diatoma problematica LM6 Diatoma problematica LM5
Length Range
6.6-43.4 µm
Width Range
3-5 µm
Striae in 10 µm
>40

Diatoma moniliformis

Kütz. 1833

Diatoma moniliformis LM4 Diatoma moniliformis LM3 Diatoma moniliformis LM5 Diatoma moniliformis LM1 Diatoma moniliformis LM2
Length Range
10–40 µm
Width Range
2.5-6.0 µm
Striae in 10 µm
50-60

Diatoma tenuis

C.Agardh 1812

Diatoma tenuis LM7 Diatoma tenuis LM6 Diatoma tenuis LM4 Diatoma tenuis LM5 Diatoma tenuis LM1 Diatoma tenuis LM3 Diatoma tenuis LM2
Length Range
20-85 µm
Width Range
2.9-4.9 µm
Striae in 10 µm
45-60

Diatoma ehrenbergii

Kütz. 1844

Diehrenbergii 9 Diehrenbergii 8 Diehrenbergii 1 Diehrenbergii 2 Diehrenbergii 4 Diehrenbergii 6 Diehrenbergii Nyc
Length Range
31-121 µm
Width Range
4.5-9.3 µm
Striae in 10 µm
35-40