Taxonomy of 16 indigenous ciliate species (Protozoa, Ciliophora) from South Korea Author Kim, Ji Hye Natural Science Research Institute, Gangneung-Wonju National University, Gangneung, Republic of Korea Author Omar, Atef Natural Science Research Institute, Gangneung-Wonju National University, Gangneung, Republic of Korea & Department of Zoology, Al Azhar University, Assiut, Egypt Author Jung, Ji Hye Moon and Jae-Ho text Journal of Species Research 2020 9 4 427 442 journal article 10.12651/JSR.2020.9.4.427 2713-8615 13139398 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).