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Compare Surirella iowensis

R.L.Lowe 1973

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Surirella iowensis is very similar to S. brebissonii and S. ovalis, except that S. iowensis is torsioned about the apical axis. Under the SEM, the rows of areolae of S. iowensis can be seen to decrease in number from 3-4 to 1-2 toward the apical axis. In contrast, S. brebissonii and S. ovalis have constant numbers of striae on throughout the valve. Surirella iowensis also differs from S. ovalis by its broadly rounded headpole in its largest valves while S. ovalis has a cuneately rounded headpole.

LM scalebar = 10 µm
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

Surirella brebissonii

Krammer and Lange-Bert. 1987

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