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A DIC image of the cell body. The circular mass within the cell is the nucleus; the elongate form just below it is a diatom frustule. Image courtesy of Samuel S. Bowser, Wadsworth Center. This image first appeared in J. Foram Res. 32:364-374 (2002) and is used with permission.
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This species has a test composed of two polygonal, slightly convex agglutinated plates. Juvenile A. triangularis tend to have three or four sides to the polygon, while larger specimens have more. The white sphere at lower right is a cell body removed from its test. Image courtesy of Samuel S. Bowser, Wadsworth Center.
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These individuals are in the process of constructing new tests from quartz grains. Bcause members of the genus Astrammina have sturdy theca, they can easily be removed from their tests without injury. This allows easy study of the process of test assembly in these agglutinating forams. Image courtesy of Samuel S. Bowser, Wadsworth Center.