Roombia truncata Okamoto et al., 2009

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 : 176

Roombia truncata Okamoto et al., 2009

Figs 1g, 2k

Description: Cells are oblong, 11–14 µm long, 6–7 µm wide, flattened, and rigid. There are no surface structures on both faces of the cell. Two flagella arise near the anterior-lateral side of the cell separately by a small protrusion. Both flagella are of similar length and are not acronematic. The anterior flagellum beats backwardly in a small excursion and the posterior flagellum is usually held down. The nucleus is located in the centre of the cell. The cells appear to move by skidding. When the cells rest, the anterior flagellum lies along the margin of the cell. Rarely observed.

Remarks: This species has been reported at marine sites in Canada (Nova Scotia), Korea, tropical Australia and Gippsland Basin ( Australia) with a length of 11– 17 µm ( Lee 2002b, 2006b, 2015; Okamoto et al. 2009).

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.