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Compare Surirella pinnata

W.Smith 1853

Compare

Surirella pinnata is most similar in size and shape to S. minuta, and the two taxa have been easily confused. Surirella minuta has shorter fibulae that do not extend into the valve center. Surirella pinnata can also be confused with S. brebissonii and S. ovalis, particulary for specimens at the low end of the size range. Surirella brebissonii and S. ovalis have rounded valve margins and a lower stria density. Surirella lacrimula differs by ovate valves. Surirella angusta has isopolar valves.

LM scalebar = 10 µm
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 angusta

Kütz. 1844

Surirella angusta LM1 Surirella angusta LM5 Surirella angusta LM3 Surirella angusta LM6 Surirella angusta LM7 Surirella angusta LM2 Surirella angusta LM4
Length Range
15.5-60 µm
Width Range
6.5-12 µm
Striae in 10 µm
23-28

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

Surirella suecica

Grunow in Van Heurck 1881

Gc45805 Suecica 3 Gc111490B Suecica 2 Gc111490B Suecica 1 Gc110482A Suecica 1 Gc45805 Suecica 1 Gc105958A Suecica 1 Gc45805 Suecica 2
Length Range
14-34 µm
Width Range
7-9.5 µm
Striae in 10 µm
30-36

Surirella lacrimula

J.D. English 2012

Surirella lacrimula LM1 Suirella lacrimula LM2 Suirella lacrimula LM3 Surirella lacrimula LM4 Surirella lacrimula LM5 Surirella lacrimula LM6 Surirella lacrimula LM7
Length Range
19-30 µm
Width Range
10-13 µm
Striae in 10 µm
27-33

Also compare to

Surirella minuta

Bréb. ex Kütz.