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Pteridomonas (ter-rid-owe-moan-ass) a colourless pedinellid (stramenopile) flagellate. Like other pedinellids, it has a single apical flagellum surrounded by a wreath of fine arms, and usually attached to the substrate by a fine stalk. The stalk is contractile and may also release from the substrate. The flagellum beats with an undulating beat pattern. Phase contrast.
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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
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Portrait of Pteridomonas, a small silicoflagellate with a long thin stalk. Tentacles surround the single apical flagellum. Very similar to Actinomonas, which has posterior tentacles as well. From freshwater pond near Boise, Idaho.
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Pteridomonas pulex Penard Cells spherical, usually broader than the length, in optical profiles heart to kindney-shaped, 6-12 microns long. Stalk is long and thin. Nucleus is in central. Flagellum is 3-4 times the cell length. 12-18 pseudopodia arise at the base of the flagellum and surround the anterior end of the cell.
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Pteridomonas danica Patterson and Fenchel, 1985. A colourless pedinellid, body 4.5-5 microns long, with one apical flagellum emerging from a slight depression at the anterior of the cell. The flagellum is surrounded by 12 stiffarms. Posterioly, the body gives rise to a stalk. The stalk and arms may be withdrawn in swimming cells.
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Phase contrast image of a small group of these heterotrophic flagelates. A single apical flagellum draws water twoards the thin arms that intercept food particles.
