Observations by sydneydiamond

Scale bar = 10µm

Scale bar = 10µm

Valves are bi-undulate. Photo thee and four are of the specimen in girdle view.

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Scale bar = 10µm

Scale bar = 10µm

Dorsal margin has 5 undlulations.

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Scale bar = 10µm

Scale bar = 10µm

Picture 1 is of a post initial valve (230 µm). Keeled raphe is evident.

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Raphe endings are deflecting in opposite directions and extend midway through the central area.

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The first specimen is S. gracilis. The other two don't look to belong as the valve is not wide enough and ends are too narrowly rounded.

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Footpole Width: 4.2-4-4
Headpole Width: 6-8.1

Scale bar = 10µm

Scale bar = 10µm

Dorsal margin has 11-13 undulations.

Scale bar = 10µm

Scale bar = 10µm

Domed central area, Rimoportula visible.

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Striae composed of irregular spaced punctae.

Scale bar = 10µm

Photo 3 is of an initial valve. Punctuate striae is evident in the specimen.

Scale bar = 10µm

Scale bar = 10µm

Scale bar = 10µm

Scale bar = 10µm

Scale bar = 10µm

First and second photo are the specimen in its girdle view.