Meseres corlissi Petz & Foissner, 1992

Jung, Jae-Ho & Yeo, Jeong Hyeon, 2020, New record of five ciliate species from temporary ponds on a grass lawn, Journal of Species Research 9 (1), pp. 68-76 : 75

5. Meseres corlissi Petz & Foissner, 1992

Diagnosis. Body size 30-57 × 26-50 μm (on average 47.1 × 38.9 μm) after protargol impregnation. Body globular to slightly ellipsoidal, outline U-shaped with truncated anterior end, transverse section round. Macronucleus triangle to liver-shaped (18-27.2 × 8.3-12.8 μm) with one globular micronucleus (3.3-4.8 × 2.9-4.0 μm). Eight equatorial somatic kineties, with long cilia; 9-12 and 10-14 cilia in kineties 1 and 2, respectively. Oral apparatus composed of anterior (16-18) and ventral (11-14) membranelles, and paroral membrane.

Distribution. Africa, Australia, Europe, China, North America, and Korea.

Remarks. The Korean population corresponds well with the type population ( Petz and Foissner, 1992); however, the Korean population is slightly smaller (vs. 53-78 × 47-66 μm in protargol preparations). Meseres corlissi is a widely distributed but rare planktonic ciliate. Weisse et al. (2008) reported that, of five clonal cultures collected from four continents, a Chinese culture significantly differed from the other cultures based on genetics, morphology, and ecology. Considering the number of kinetids in kinety 2, the Korean population differs from the Chinese (10-14 vs. 14-19); however, it should be noted that the numbering system on the somatic kineties from the original description differs from the system by Weisse et al. (2008).

Voucher slides. Two slides of protargol impregnated specimens were deposited at National Institute of Biological Resources, Korea (NIBRPR0000110183, NIBRPR 0000110184).