Diatoms of North AmericaDiatoms of North America
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Compare Fragilaria crotonensis

Kitton 1869

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Fragilaria tenera has narrowly lanceolate valves with no inflated central margin. Colonies are rarely formed by F. tenera, whereas F. crotonensis commonly forms long ribbon-like colonies with 10-40 (or more) cells.

LM scalebar = 10 µm
Ansp Gc112455 5 Ansp Gc112455 6 Ansp Gc112455 1 Ansp Gc112455 11 Ansp Gc112455 3
Length Range
60-72 µm
Width Range
2-3 µm
Striae in 10 µm
17-18

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