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 5. Apokeronopsis wrighti Long, Liu, Liu, Miao, Hu, Lin & Song, 2008 ( Fig. 5 ) Material examined. Marine water (salinity, 29.3‰) collected from the mud flat of Oryun-ri , Dosan-myeon , Tongyeong-si , Gyeongsangnam-do , Korea ( 34°54′30.10″ N 128°20′3.90″E ) on 6 May 2019 . Fig. 4. Photomicrograph of Epiclintes auricularis rarisetus in vivo (A, B) and after protargol impregnation (C). A. Fully elongated and typical body shape in vivo . B. Detail of dorsal bristles on papillae. C. Ventral ciliature. DB, dorsal bristles; FVR, frontoventral row; TC, transverse cirri. Scale bars = 50 μm (A); 20 μm (B); 30 μm (C). Fig. 5. Photomicrograph of Apokeronopsis wrighti in vivo (A, B) and after protargol impregnation (C, D). A. Typical body shape in vivo . B. Details of reddish cortical granulation (arrowheads) and greenish minute cortical granules distributed all over the cortex. C. Ventral ciliature. D. Dorsal kineties. MVR, midventral cirral row; TC, transverse cirrus. Scale bars= 50 μm. Fig. 6. Photomicrograph of Pseudokeronopsis carnea in vivo (A) and after protargol impregnation (B, C). A. Body shape and details of the bright reddish cortical granulation. B. Ventral ciliature. C. Dorsal kineties. 1-5, dorsal kineties; CG, cortical granules; MVP, midventral pairs; PTC, pretransverse cirri; TC, transverse cirri. Scale bars =50 μm. Diagnosis. Body size in vivo 150-210 × 40-60 μm (n = 3); ellipsoidal with rounded anterior and posterior end; two types of cortical granules, type I brick red, globular to slightly ellipsoidal, about 1-2 μm across, and grouped in rows along the dorsal kineties and ciliary rows; type II greenish, minute, about 0.3 μm across, and arranged in rows all over the cortex; invariably 2 midventral rows with equal number (40-47) of cirri; 7-9 buccal, 2 or 3 frontoterminal cirri; left and right marginal rows with 31- 43 and 33-44 cirri, respectively; 30-34 transverse cirri extending anteriorly beyond the level of mid-body; 3 dorsal kineties. Distribution. China and Korea . Remarks. The Korean population of A. wrighti is identical to the Chinese type population ( Long et al., 2008 ). Apokeronopsis wrighti is also similar to the closely relat- ed species A. crassa in most features but they can be easily distinguished from each other by the arrangement (in rows vs. sparsely arranged) of the cortical granules ( Shao et al. , 2007 ). Voucher slides. Two slides with protargol-impregnated specimens were deposited at National Institute of Biological Resources (NIBRPR0000110190, NIBRPR0000110 191).