Diatoms of North AmericaDiatoms of North America
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Compare Fragilaria amphicephaloides

Lange-Bert. in Hoffman et al. 2011

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Fragilaria radians has wider valves with a lower stria density (9 to 11 in 10 µm, Hofman et al. 2011). Fragilaria tenera has narrower, lanceolate valves with a higher stria density.

LM scalebar = 10 µm
Frampicephaloides 1A Framphicephaloides 2A Framphicephaloides 3A Framphicephaloides 6A Frampicephaloides 4A Frdistans 5 Frdistans 7
Length Range
42.3-71.4 µm
Width Range
2.6-3.9 µm
Striae in 10 µm
11-13

Fragilaria tenera

(W.Sm.) Lange-Bert. 1980

F Tenera 114970 3 10 Um Bar F Tenera 114970 6 10 Um Bar F Tenera 114970 9 10 Um Bar F Tenera 114970 5 10 Um Bar F Tenera 114970 8 10 Um Bar F Tenera 114970 7 10 Um Bar F Tenera 114970 4 10 Um Bar
Length Range
50-75 µm
Width Range
2.0-2.5 µm
Striae in 10 µm
15-17

Also compare to

Fragilaria radians

(Kütz.) D.M.Williams and Round