Diatoms of North AmericaDiatoms of North America
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Compare Surirella brebissonii

Krammer and Lange-Bert. 1987

Compare

Surirella brebissonii is distinguished from most of the other low-keeled species of Surirella by it's greater width, lower fibula and costa density, and rounded valve outline. Only the larger valves of S. brebissonii and S. ovalis can be distinguished. The larger valves of S. brebissonii have one broadly rounded apex and one cuneately rounded apex, while S. ovalis has two cuneately rounded apices. Smaller valves of the two species, however, are virtually indistinguishable. The only difference between them is the number of portulae, a structure visible in SEM. Surirella brebissonii has 3 to 4 portulae between the fibulae, while S. ovalis has only one.

LM scalebar = 10 µm
Gc112761A Brebissonii 9 Gc112761A Brebissonii 10 Gc112761A Brebissonii 4 Gc112761A Brebissonii 3 Gc112761A Brebissonii 8 Gc109819B Brebissonii 3 Gc112761A Brebissonii 7
Length Range
15.5-56 µm
Width Range
10-25 µm
Striae in 10 µm
18-23

Surirella ovalis

Bréb. 1838

Gc109807B Ovalis 6 Gc106518B Ovalis 3 Gc109807B Ovalis 5 Gc109807B Ovalis 4 Gc106518B Ovalis 1 Gc109807B Ovalis 2 Gc109807B Ovalis 3
Length Range
14-75 µm
Width Range
11-35 µm
Striae in 10 µm
14-17

Surirella pinnata

W.Smith 1853

Surirella minuta LM1 Surirella minuta LM5 Surirella minuta LM2 Surirella minuta LM3 Surirella minuta LM6 Surirella minuta LM4 Surirella minuta LM7
Length Range
18-71 µm
Width Range
8.5-14 µm
Striae in 10 µm
25-32

Surirella iowensis

R.L.Lowe 1973

Surirella iowensis LM7 Surirella iowensis LM6 Surirella iowensis LM4 Surirella iowensis LM2 Surirella iowensis LM3 Surirella iowensis LM1 Surirella iowensis LM5
Length Range
21-54 µm
Width Range
15-33 µm
Striae in 10 µm
16-26