Trepomonas agilis Dujardin, 1841

Lee, Won Je, 2019, Small Free-Living Heterotrophic Flagellates from Marine Intertidal Sediments of the Sydney Region, Australia, Acta Protozoologica 58 (4), pp. 167-189 : 174

Trepomonas agilis Dujardin, 1841

Figs 1d, 2d

Description: Cell is ovoid, but S-shaped in cross section and is about 10 µm long. Two nuclei are located anteriorly. Two groups of flagella are inserted laterally at the end of each groove: two long flagella and six short flagella. The length of the long flagella was not measured, but the short flagella are less than half the cell length and lie in the grooves. The cell moves by swimming. Contractile vacuoles are seen. One cell was observed at Kogarah Bay.

Remarks: This species has been found at a marine site in Australia ( Bernard et al. 2000), and also has been reported widely from freshwater, wastewater and anoxic (e.g. Playfair 1921, Lavier 1936, Calaway and Lackey 1962, Brugerolle 1973, Eyden and Vickermann 1975, Zhukov and Mylnikov 1983, Fenchel et al. 1995). Previously reported cell length ranges are from 8 to 22 µm. This genus was reviewed by Mylnikov (1985) to include 7 nominal species: Trepomonas agilis Dujardin, 1841 , T. angulatus Klebs, 1893 , T. communis Klebs, 1893 , T. latecapitata Skuja, 1956 , T. rotans Klebs, 1893 , T. simplex Klebs, 1893 , T. steini ( Stein, 1878) Klebs, 1893 . Trepomonas agilis is hard to distinguish T. angulatus , T. communis and T. simplex , which have similar features such as cell appearance and having two long flagella and six short flagella ( T. agilis , 8-22 µm; T. angulatus , 30 µm; T. communis , 13–25 µm; T. simplex , 7–8 µm). Trepomonas communi s was regarded as a junior synonym of T. agilis ( Bernard et al. 2000) . Here, other two species ( T. angulatus and T. simplex ) are regarded as junior synonyms of T. agilis .

Figures

Fig. 2. (a)–(b) Mastigamoeba psammobia, (a) general appearance of cell, note cytoplasms drawn from the posterior end, (b) general appearance of different cell and note pseudopodia. (c) Hexamita inflata, general appearance, note the nucleus. (d) Trepomonas agilis, general appearance of cell. (e) Chilomastix cuspidata, showing general appearance. (f) Stephanopogon sp., showing general appearance. (g) Saepicula pulchra, showing general appearance of cell. (h)–(j) Goniomonas amphinema. (h) Form I, (i) Form II, (j) Form III, note flagellar ar- rangement. (k) Roombia truncata, note attached cell to the substrate by the tip of the posterior flagellum, note extrusomes, surface striations and deep gullet. (l) Telonema subtilis, showing general appearance. (m) Harpagon descissus, general appearance of cell. (n)–(o) Spironema multiciliatum, (n) general appearance of cell, (o) note the kinetics. (p) Psammosa unguis, general appearance of cell. (q) Bicosoeca conica, general appearance of cell. (r) Apusomonas proboscidea, genera appearance of cell, note the V-shaped structure on dorsal face. All micrographs are DIC images except for (b), which is phase contrast images. Scale bar in (r) = 10 μm for all figures.