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Actinomonas (act-in-o-moan-ass) is a colourless pedinellid, single anterior flagellum surrounded by a wreath of (12) arms, two of which can be seen to either side of the flagellum. Often with additional arms extending from other parts of the body. Not rare. very (very) similar to Pteridomonas. Flagellum photographically frozen in sine-wave beat pattern that is typical of stramenopiles. Phase contrast.
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Actinomonas (act-in-o-moan-ass) is one of the pedinellid stramenopiles, a small flagellate with an apical flagellum (upper) and stalk (lower). Usually with a number of fine arms around the flagellum. These arms intercept bacteria and other suspended particles. They may also be withdrawn, as is the case here. The flagellum has not been frozen by the photography and what we see is the beat envelope. Phase contrast.
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Actinomonas (ack-tin-owe-moan-ass) mirabilis is to all intents and purposes indistinguishable from Pteridomonas danica (there are small ultrastructural differences). Cells are 4 to 6 microns long and have one flagellum emerging from a small depression in the anterior end of the cell. The cells have a ring of arms around the flagellum and below the equator of the cell, the arms around the flagellum are evenly spaced. The anterior part of the cell is slightly broader than the posterior part. The single thickened flagellum is about 3 - 5 times the cell length and has an undulating beat. The cells usually swim rapidly, but occasionally attach to the substrate with a long posterior stalk trailing. Small particles are seen on the cell surface. Sometimes commonly observed.
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Actinomonas mirabilis Kent, 1880. Colourless pedinellid, cell body measuring 5-8 microns, and often stalked. Arms present, up to two rings of 12 arms each around the anterior flagellum and extending from other parts of the body. When disturbed may swim with arms trailing from posterior.
