Compare

Surirella angusta is similar, but it lacks a craticula-like structure, has higher density of more narrow costae and differs in other details visible under SEM. Small specimens of S. arctica with a poorly developed or eroded craticula-like structure may hardly be differentiated from S. angusta.

Both S. heardensis and S. subantarctica have a craticula-like structure, but it is less robust with narrower costae. These taxa also have more rounded apices, can reach larger size, especially the valve width, and are typically constricted mid-valve. Both taxa have been confirmed only from the sub-Antarctic region.

LM scalebar = 10 µm
Surirella arctica LM1 Surirella arctica LM2 Surirella arctica LM3 Surirella arctica LM4 Surirella arctica LM5 Surirella arctica LM6 Surirella arctica LM7
Length Range
19–56 µm
Width Range
6–9 µm
Striae in 10 µm
22–25

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

Also compare to

Surirella heardensis

Van de Vijver and Cocquyt in Van de Vijver et al. 2013

Surirella subantarctica

Van de Vijver and Cocquyt in Van de Vijver et al. 2013

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