Stylonychia lemnae Ammermann and Schlegel

Kim, Ji Hye & Jung, Ji Hye Moon and Jae-Ho, 2018, New records of 24 ciliate species (Protozoa, Ciliophora) collected in South Korea, Journal of Species Research 7 (4), pp. 291-314 : 297

6. Stylonychia lemnae Ammermann and Schlegel ,

1983 ( Fig. 6 )

Material examined. Freshwater with some debris collected from Gyeongpocheon River , Unjeong-dong , Gangneung-si, Gangwon-do, Korea (37°47 ʹ 20 ʺ N, 128°54 ʹ 34 ʺ E) on January 28, 2017 .

Diagnosis. Body size 145-230 × 60-85 μm in vivo; 84-

195 × 32-91 μm after protargol impregnation; body ellipsoidal; one contractile vacuole at mid-body of left cell margin; 2 ellipsoidal macronuclei; about 3 spherical micronuclei; undulating membranes Stylonychia -like pattern; 30-69 adoral membranelles; 3 frontal cirri; 1 buccal cirrus; 4 frontoventral cirri; 3 postoral cirri; 2 pretransverse cirri; 5 transverse cirri; 20-23 left marginal cirri; 15-36 right marginal cirri; 3 caudal cirri; 6 dorsal kineties: kinety 3 composed of 35-40 dikinetids, kinety 4 composed of 40-46 dikinetids.

Distribution. Cosmopolitan.

Remarks. Stylonychia lemnae is very similar to the S. mytilus complex and, according to the key to species ( Berger, 1999), differs in the number of dikinetids in dorsal kinety 3 (33-40 vs. 44-66) and 4 (30-39 vs. 40-56). The Kore- an population of S. lemnae exhibits an intermediate morphology between other S. lemnae populations and S. mytilus , i.e., the range of dikinetids in dorsal kinety 3 (35- 40) is in S. lemnae and 4 (40-46) is in S. mytilus . However, the number of dorsal dikinetids in kinety 4 is relatively small even though the range is within S. mytilus . Therefore, we assigned this species in S. lemnae .

Voucher slides. Two slides of protargol-impregnated specimens were deposited at National Institute of Biological Resources, Korea (NIBRPR0000109468, NIBRPR0000109469).

Figures

Fig. 6. Stylonychia lemnae in vivo(A) and after protargol impregnation (B, C). A. Typical individual. B. Oral and somatic ciliature on ventral view. C. Dorsal view. 1-6, dorsal kinety 1-6. Scale bars=100 μm(A); 50μm (B, C).