9. Pseudochilodonopsis fluviatilis Foissner, 1988

(Fig. 9)

Material examined. Brackish water (salinity 4‰) taken from the River Gyeongpocheon, Unjeong-dong, Gangneung-si, Gangwon-do, Korea (N37°47 ʹ 20 ʺ, E128°54 ʹ 34 ʺ) on December 8, 2016.

Diagnosis. Body size 70-85 × 40-50 μm in vivo; reniform; ventrally flattened; flexible; colorless; two contractile vacuoles obliquely located; postoral ventral kinety absent; 4 or 5 left somatic kineties; 4 or 5 right somatic kineties; dorsal bristles located subapical, about 3.6 μm in length; 2 circumoral kineties; preoral kinety discontinued, composed of 4 segments on anterior left margin; macronucleus ellipsoidal, 7-9 μm in diameter.

Distribution. Austria, Germany, Korea (study).

Remarks. Pseudochilodonopsis fluviatilis Foissner, 1988 can be separated from P. algivora (Kahl, 1931) Foissner, 1979 by the difference in the shape of the posterior end (indented vs. smooth) (Foissner et al., 1991).

Pseudochilodonopsis fluviatilis and P. piscatoris (Blochmann, 1895) Foissner, 1979 can be separated from each other by their body outline (reniform vs. slightly lanceolate) and the position of the dorsal brush (apical vs. subapical) (Foissner et al., 1991).

Voucher slides. Two slides, including protargol-impregnated specimens, were deposited at the National Institute of Biological Resources, Korea (NIBRPR0000107910, NIBRPR0000107911).