Trichodina mutabilis Kazubski et Migala, 1968 (fig. 2, c) L o c a l i t y. Lake Berizka and the Danube delta (table 1). D e s c r i p t i o n. Cell diameter 51.1–82.4 (64.7 ± 10.6; 14), diameter of adhesive disc 41.3–68.4 (54.1 ± 8.4; 14). Denticle number 23–29 (25.6 ± 2.0; 14). Width of border membrane 3.0–5.5 (3.9 ± 0.8; 14), diameter of denticle ring 24.1–35.1 (30.6 ± 3.1; 14). Central zone of the denticle ring is clear and evenly impregnated by silver. Blade rectangular, length of blade 6.0–8.8 (7.5 ± 0.9; 14); the blade having rounded distal edge with the tangent point lower than the distal point; posterior blade surface almost straight, forming very shallow curve; distal surface of the blade rounded and not parallel to border membrane; central part delicate and closely associated with the following denticle. Rays thin and straight clearly directed posteriorly, length of ray 5.3–8.3 (7.1 ± 0.9; 14).

Published as part of Drobiniak, O., Kutsokon, Yu. & Kvach, Yu., 2014, Trichodinids (Ciliophora, Peritrichia) Of Perccottus Glenii (Actinopterygii, Odontobutidae) In Three Ukrainian Rivers, pp. 231-238 in Vestnik Zoologii 48 (3) on page 235, DOI: 10.2478/vzoo-2014-0026, http://zenodo.org/record/6453044