Varistrombidium kielum (Maeda & Carey, 1985)

Kim, Ji Hye, Omar, Atef & Jung, Ji Hye Moon and Jae-Ho, 2020, Taxonomy of 16 indigenous ciliate species (Protozoa, Ciliophora) from South Korea, Journal of Species Research 9 (4), pp. 427-442 : 435

9. Varistrombidium kielum (Maeda & Carey, 1985)

Xu, Sun, Clamp, Ma & Song, 2011 ( Fig. 9 )

Material examined. Marine water with seaweed (salinity, 24.6‰) collected from Gunsuncheon Stream , Gangdong-myeon , Gangneung-si, Gangwon-do, Korea (37°44′27″N 128°59′2″E) on 16 Apr 2019 .

Diagnosis. Body size in vivo 50-65 × 30-35 μm (n = 3); obconical to barrel shape; extrusomes conspicuous in vivo, about 10 μm in length; single ellipsoidal macronucleus; apical protrusion filled with reddish granules; about 7 buccal and 18 collar membranelles; 5 somatic kineties (SK), SK1 commences on left side, extends rightward, turning back and terminates near posterior end, SK2 commences below starting point of SK1, extends leftward in the opposite direction of SK1 and terminates near posterior end, SK3 parallel to SK2 and arranged only ventral side, SK4 and 5 arranged parallel to SK3 with gap; girdle and ventral kineties absent.

Distribution. China and Korea.

Remarks. Varistrombidium kielum is monotypic and characterized by complex arrangement of 5 somatic kineties ( Xu et al., 2009; 2011).

Voucher slides. Two slides with protargol-impregnated specimens were deposited at National Institute of Biological Resources (NIBRPR0000110209, NIBRPR0000110 210).

Figures

Fig. 9. Photomicrograph of Varistrombidium kielum in vivo (A, B) and after protargol impregnation (C-E). A, B. Body shape and cytoplasmic inclusions. C. Somatic kineties arrangement of right and dorsal side. D. Somatic kineties arrangement of left side. E. Somatic kineties of ventral side. SK1-5, somatic kineties 1-5. Scale bars=20μm (B, E); 10μm (C, D).