Description
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 differ in the presence of a very reduced flagellar wing and paraxone- mal rod and in the presence of 2 ring -I ike structures below the transverse septum of the flagellar transition region (Patterson and Fenchel 1985). Such rings are also present in Apedinella but not in any other pedinellid. H et- erotrophic, feeding on bacteria and on other protists . Three species in marine, freshwater , and brackish environments. Pteridomonas danica Patterson and Fenchel (Figs. 4A-D,8C) . Cells 3.5-5.5 1--lm in diameter. Attached with a narrow contractile stalk of variable length, mostly 15-25 long. With c. 1 2 tentacles around the flagellum base. Cells may detach from the substrate and swim freely, often with the tentacles resorbed and occasionally with the stalk resorbed . Cells caught in debris may deform and move by amoeboid locomotions (Patterson and Fenchel 1985). Common but of- ten confused with Actinomonas. 782 SILICOFLAGELLA
Type species
Figures
Raw text
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 differ in the presence of a very reduced flagellar wing and paraxone- mal rod and in the presence of 2 ring -I ike structures below the transverse septum of the flagellar transition region (Patterson and Fenchel 1985). Such rings are also present in Apedinella but not in any other pedinellid. H et- erotrophic, feeding on bacteria and on other protists . Three species in marine, freshwater , and brackish environments. Pteridomonas danica Patterson and Fenchel (Figs. 4A-D,8C) . Cells 3.5-5.5 1--lm in diameter. Attached with a narrow contractile stalk of variable length, mostly 15-25 long. With c. 1 2 tentacles around the flagellum base. Cells may detach from the substrate and swim freely, often with the tentacles resorbed and occasionally with the stalk resorbed . Cells caught in debris may deform and move by amoeboid locomotions (Patterson and Fenchel 1985). Common but of- ten confused with Actinomonas. 782 SILICOFLAGELLA