Chaenea vorax Quennerstedt, 1867

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 : 302

12. Chaenea vorax Quennerstedt, 1867 ( Fig. 12 )

Material examined. Marine water (salinity 29‰) collected from Anin Beach , Gangdong-myeon , Gangneung-si, Gangwon-do, Korea (37°44 ʹ 4.7 ʺ N, 128°59 ʹ 24.2 ʺ E) on June 7, 2018 .

Diagnosis. Elongated body size about 90 × 10 μm in vivo; 65-85 × 11-13 μm after protargol impregnation; body contractile and flexible with vermiform; single contractile vacuole terminally located; oral extrusomes wedge-like shape and 5-6 μm in length; ellipsoidal numerous macronuclei; 14 somatic kineties; 3 or 4 short dorsal brush rows; dorsal brush about 2 μm in length.

Distribution. Cosmopolitan.

Remarks. The Korean population of C. vorax is different from the Chinese population in the body length (about 90 μm vs. 100-180 μm) and number of somatic kineties (14 vs. 11 or 12) ( Song and Packroff, 1996 /97). Chaenea vorax differs from the most similar species C. teres (Dujardin, 1841) Kent, 1881 by the shape of oral extrusomes (wedge-like shape vs. rod-like shape), the length of extrusomes (5-6 μm vs. 9 μm) and the length of dorsal brush (2 μm vs. 10 μm) ( Fan et al., 2015).

Voucher slide. One slide of protargol-impregnated specimens was deposited at National Institute of Biological Resources, Korea (NIBRPR0000109439).

Figures

Fig. 12. Chaenea vorax in vivo (A, B) and after protargol impregnation (C-E). A. Typical individual. B. Oral and cytoplasmic extrusomes and contractile vacuole (arrows indicate food vacuoles). C. Somatic ciliature. D. Detail of dorsal brush rows(arrows). E. Macronuclear nodules (arrowheads). Scale bars=50 μm (A); 30μm (C).