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Authority

N/A

Class

Diatomophyceae

Order

Pennales

Family

Pleurosigmataceae

Synonyms

N/A

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Basionym

N/A

Additional References

N/A

Description

Cells solitary, usually lying in valve view. Valves linear to lanceolate, sigmoidal; apical axis 170–210 µm; transapical axis 25–50 µm; pervalvar axis, 20–40 µm. Raphe sigmoidal, central on valve face, with terminal raphe endings turned in the same direction as the valve pole; central raphe endings turned in the opposite direction. Transverse and longitudinal striae fine; transverse striae slit-like, 26–28 in 10 µm; longitudinal striae 14–16 in 10 µm. Chloroplasts 2, plate-like.

Distribution

Franklin I., Ross Sea.

Comments

Insufficient material was examined for an unambiguous identification. Species of Gyrosigma have a similar raphe and valve system to those of Pleurosigma.

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