Strombidium apolatum Wilbert & Song, 2005

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 : 434

8. Strombidium apolatum Wilbert & Song, 2005

( Fig. 8 )

Material examined. Marine water with some debris (salinity, 29.3‰) collected from Hamdeok Beach , Jocheoneup, Jeju-si, Jeju-do, Korea (33°32′36″N 126°39′51″E) on 8 Jun 2019 .

Diagnosis. Body size in vivo 60-70 × 30-35 μm (n = 3); elongate obconical, dorsoventrally flattened, and partially covered with hemitheca; extrusomes conspicuous in vivo, about 15 μm in length; single elongate ellipsoidal macronucleus; apical protrusion filled with reddish granules; about 5 buccal and 15 collar membranelles; girdle kinety opened and left part of dikinetids directed to ventral kinety; ventral kinety arranged from ventral to dorso-lateral side.

Distribution. China, King George Island, and Korea.

Remarks. The Korean population of Strombidium apolatum agrees with the type population in most aspects except of the body size (60-70 × 30-35 μm vs. 50 × 40 μm). Strombidium apolatum can be easily distinguished from other congeners by the dorsoventrally flattened (vs. non-flattened) body, the discontinuous (vs. continuous) girdle kinety, and the presence (vs. absence) of the hemitheca that covers two thirds of body ( Wilbert & Song, 2005; Xu et al., 2009).

Voucher slides. Two slides with protargol-impregnated specimens were deposited at National Institute of Biological Resources (NIBRPR0000110207, NIBRPR0000110 208).

Figures

Fig. 8. Photomicrograph of Strombidium apolatum in vivo (A, B) and after protargol impregnation (C, D). A. Body shape in vivo with food vacuoles filled with green algae. Note that the body is covered with hemitheca (arrows). B. Extrusomes. C, D. Nuclear apparatus, the discontinuous girdle kinety, and the ventral kinety. E, extrusomes; GK, girdle kinety. Scale bars=20 μm.