Slightly oblique view of the trilobed aperture of the test of Difflugia gramen (Penard, 1902). Collected from a freshwater pond near Boise, Idaho. June 2005. Brightfield. This image was taken by William Bourland. He now uses a Zeiss Axioskop 2 with Spot Insight and Spot Flex CCD cameras (Diagnostic Instruments). Image copyright: William Bourland, image used under license to MBL (micro*scope).
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From the collection
Freshwater and Terrestrial Microbes of Idaho (USA) and Elsewhere
|Description of Difflugia gramen: Testate amoebae, lorica is brown or purplish-grey, spherical or ovoid. The surface is rough and covered with sand-grains, but like D. corona the gaps between large particles are often filled with smaller fragments. The aperture is trilobed and is surrounded by a slightly raised collar of small particles cemented together. Length of shell 70-98 microns, breadth of shell 55-95 microns, diameter of aperture 28-36 microns. |