Cercomonas hiberna Howe & Cavalier-Smith, 2009

Lee, Won Je, 2020, First records of nine free-living heterotrophic flagellates from South Korea, Journal of Species Research 9 (4), pp. 448-454 : 450-451

4. Cercomonas hiberna Howe & Cavalier-Smith, 2009

( Fig. 2a -d )

Material examined. Korea, Gyeongsangbuk-do, Bongwha-gun, Sukpo-myeon, Nakdonggang River (37°02′30″ N, 129°03′04″E), 21 Jul 2015, collected by Won Je Lee.

Description. Cells are 5.6-10.9 (avg. 8.4) μm and very plastic. The anterior flagellum is 1.8-2.3 times the cell length and sweeps gently. The posterior flagellum is 1.7- 2.2 times the cell length and may attach to the cell body. Lamellar, finger-like and filose cytoplasmic strand is drawn from the posterior end of the cell ( Fig. 2d ). Lamellar and finger-like pseudopodia are all over the cell, but predominantly on the left side of the cell ( Fig. 2d , arrowheads). 1-2 contractile vacuoles are seen; usually on the right side of cell, and the other in posterior half ( Fig. 2a, 2c ). The cells glide with the flagella in contact with the substrate.

Previously reported cell length. 7-13 μm ( Bass et al., 2009).

Habitat. Freshwater sediments, soils.

World distribution. UK ( Bass et al., 2009), Korea.

Deposition. National Institute of Biological Resources, Korea (NIBRPR0000109188).

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.