Certesia quadrinucleata Fabre-Domergue, 1885

Omar, Atef & Jung, Ji Hye Choi and Jae-Ho, 2023, New record of ten ciliate species (Protozoa, Ciliophora) from South Korea, Journal of Species Research 12 (1), pp. 95-108 : 99

4. Certesia quadrinucleata Fabre-Domergue, 1885

( Fig. 4 )

Material examined. Marine water collected from Gyeongpo Lake , Gangmun-dong , Gangneung-si, Gangwon-do, Korea (37°47 ʹ 55 ʺ N, 128°54 ʹ 59 ʺ E) on February 11, 2020 .

Diagnosis. Size 40 - 50 × 25 - 30 μm after protargol impregnation (n = 5); body ovoid with a spine like projection on right margin of anterior end; invariably 4 ellipsoidal macronuclear nodules connected by short funiculus; adoral zone of membranelles occupies about 40% of body length and composed of 19 - 20 membranelles; 10 or 11 frontoventral cirri, invariably 5 transverse cirri; left marginal row with 4 - 5 cirri; 5 - 6 dorsal kineties; caudal cirri lacking.

World distribution. China, France, Germany, Japan, USA, South Korea.

Remarks. The Korean population of Certesia quadrinucleata is most similar to the Japanese population described by Hu (2013). Also, these two populations agree with other previously described populations but they are significantly smaller (40 - 50 × 25 - 30 μm in the Korean population and 40 - 75 × 20 - 40 μm in the Japanese population vs. 66 - 92 × 44 - 68 μm in Chinese population, 75 - 80 μm in French population, 70 - 100 μm in German population, and 54 - 78 × 34 - 53 μm in USA population) ( Fabre-Domergue, 1885; Kahl, 1932; Wicklow, 1983). Certesia quadrinucleata is unique among the euplotid ciliates in having a left marginal row and the lack of caudal cirri, thus in their revision of the order Euplotida, Borror and Hill (1995) established the new family Certesiidae for the monotypic genus Certesia .

Voucher slides. One slide with protargol-impregnated specimens was deposited at the National Institute of Biological Resources, Korea (NIBRPR0000110840).

Class Nassophorea Small and Lynn, 1981

Order Synhymeniida de Puytorac et al. in Deroux, 1978

Family Scaphidiodontidae Deroux in Corliss, 1979 Genus Chilodontopsis Blochmann, 1895

Figures

Fig. 4. Certesia quadrinucleata after protargol impregnation. A, B, Ventral and dorsal view showing the body shape, the spine-like projection on right side of anterior end (arrow), the ventral and dorsal ciliature, and the nuclear apparatus. AZM, adoral zone of membranelles; DB, dorsal bristles; LMR, left marginal row; MA, macronuclear nodule; TC, transverse cirri; VC, ventral cirri. Scale bars 20μm.