ca. 3

Generic characters: Cells solitary.

Cells in valve view regularly quadrangular and in one species alternatively irregularly triangular to quinqueangular.

Central bilabiate process with short external tube.

Poroid areolae in radial rows from nonperforated central area.

Circular concavity in middle of valve face.

No depressions between valve corners and central area.

Characters showing differences between species: Cell size. Valve outline. Size of central depression.

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