Portrait of Pteridomonas, a small silicoflagellate with a long thin stalk. Tentacles surround the single apical flagellum. Posterior contractile vacuole can be seen here. Very similar to Actinomonas, which has posterior tentacles as well. The two species also have ultrastructural differences. From freshwater pond near Boise, Idaho. Oblique illumination 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 Pteridomonas: Cells very similar to Actinomonas, but tentacles are mainly confined to an anterior ring around the flagellum, and the cells are usually attached to a substratum. They also differs in the presence of a very reduced flagellar wing and paraxonemal rod and in the presence of two ring-like structures below the transverse septum of the flagellar transition region. Such rings are also present in Apedinella but not in any other pedinellid. Heterotrophic, feeding on bacteria and on other protists. Three species in marine, freshwater and brackish environments. |