Eocercomonas echina 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 : 452

6. Eocercomonas echina Howe & Cavalier-Smith, 2009

( Fig. 2j -o )

Material examined. Korea, Gyeongsangnam-do, Changwon, Gwangnyeocheon Stream (35°14′50″N, 128°30′ 36″E), 27 Oct 2017, collected by Won Je Lee.

Description. Cells are 4.7-6.5 (avg. 5.3) μm long and plastic. The anterior flagellum is 1.2-1.8 times the cell length and beats slowly. The posterior flagellum is 1.3-1.8 times the cell length and attaches to the cell body. Cytoplasmic strand is drawn out from the posterior end of the cell, but may not be seen ( Fig. 2o ). Numerous finger-like pseudopodia are seen all around the cell. 1-2 contractile vacuoles are posterio-centrally located ( Fig. 2m, 2n ). The cells glide slowly by gliding.

Previously reported cell length. 6-10 μm ( Bass et al., 2009).

Habitat. Freshwater sediments, soils.

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

Deposition. National Institute of Biological Resources, Korea (NIBRPR0000109208).

Identifiers. Won Je Lee.

Order Paracercomonadida Cavalier-Smith, 2018 Family Paracercomonadidae Cavalier-Smith in Cavalier-Smith & Karpov, 2012

Genus Paracercomonas Karpov et al., 2006

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.