Cercomonas pellucida Brabender, Domonell, Kiss

Lee, Won Je, 2020, First records of nine free-living heterotrophic flagellates from South Korea, Journal of Species Research 9 (4), pp. 448-454 : 451-452

5. Cercomonas pellucida Brabender, Domonell, Kiss ,

Nitsche & Arndt, 2012 ( Fig. 2e -i )

Material examined. Korea, Gyeongsangbuk-do, Bongwha-gun, Sukpo-myeon, Nakdonggang River (37°02′30″ N, 129°03′04″E), 21 Jul 2015, collected by Eun Hee Kim. Description. Cells are 7.5-13 μm long and plastic. The anterior flagellum is 1.3-1.5 times the cell length and the posterior flagellum is 1.3-1.5 times the cell length. The cells rarely form finger-like and bulbous pseudopodia at the posterior end. The nucleus has a coarse appearance; the nuclear envelope is very thin but many microbodies attach to it, the nucleolus is slightly irregular, there are many granules and rods in the nucleoplasm. The nucleus is closely connected to the basal bodies ( Fig. 2e, 2i ). Cytoplasmic strand is drawn out from the posterior end of the cell, but may not be seen ( Fig. 2h ). The single large contractile vacuole is located in the posterior or lateral part of the cell ( Fig. 2i ). The cells move by gliding and consume bacteria .

Previously reported cell length. 9.1-17.2 μm ( Brabender et al., 2012).

Habitat. Freshwater sediments, soils.

World distribution. Germany ( Brabender et al., 2012), Korea.

Deposition. National Institute of Biological Resources, Korea (NIBRPR0000107970).

Identifiers. Won Je Lee.

Figures

Fig. 2. (a)-(d) Cercomonas hiberna. (a) cell 1 showing contractile vacuole, (b), (c) cell 2 showing general appearance and contractile vac- uole, (d) several cells showing cytoplasmic strand (St) and pseudopodia (arrowheads). (e)-(i) Cercomonas pellucida, showing general ap- pearance, contractile vacuole (CV), cytoplasmic strand and nucleus (N) closely connected to the basal body. (e) cell 1, (f) cell 2, (g) cell 3, (h) cell 4, (i) cell 5 & 6. (j)-(o) Eocercomonas echina, showing general appearance, contractile vacuole and cytoplasmic strand. (j) cell 1, (k) cell 2, (l), (m) cell 3, (n) cell 4, (o) cell 5. AF: anterior flagellum, PF: posterior flagellum. All micrographs are DIC images with the excep- tions of (h), (i) which are phase contrast images. Scale bar in (d)=10 μm for (d), and in (o)=5 μm for other figures.