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Surirella (Bacillariophyceae)

In this picture the two plates are separating from eachother. You can see the keel

that runs around the entire girdle of the cell. From a lake in New Hampshire, USA

Surirella sp. from a lake in New Hampshire, USA
This cell is in valve view and you can see the striations moving inward toward the center of the cell.

Surirella sp. from a lake in New Hampshire, USA
The photograph illustrates the raphe system of large 'keel punctae' that is running around the edge of the cell sitting on top of the keel.

Surirella sp.
Modified from photograph by G.P. Matthews posted at gpmatthews.nildram.co.uk

Surirella newmani
Photograph from California posted online

Surirella brebissonii
Photograph posted at Nordic Algae online

Surirella spiralis
Photograph by Wolf Herwig posted online where you can also see 3D images

Surirella fastuosa
Photograph posted online

Surirella fastuosa var. debilita
Photograph posted online

Surirella sp.
Photograph by Y.Tsukii, Protist Information Server posted online

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