New record of ten ciliate species (Protozoa, Ciliophora) from South Korea Author Omar, Atef Natural Science Research Institute, Gangneung-Wonju National University, Gangneung 25457, Republic of Korea Author Jung, Ji Hye Choi and Jae-Ho text Journal of Species Research 2023 12 1 95 108 journal article 10.12651/JSR.2023.12.1.095 2713-8615 13138712 1. Peritromus faurei Kahl, 1932 ( Fig. 1 ) Material examined. Marine water (salinity 26.8‰) collected from Anin Beach , Gangdong-myeon , Gangneung-si , Gangwon-do , Korea ( 37°44 ʹ 4 ʺ N , 128°59 ʹ 25 ʺ E ) on June 14, 2021 . Diagnosis. Size 60 - 100 × 40 - 55 μm in vivo and 40 - 50 × 25 - 35 μm after protargol impregnation (n = 5); body reniform with anterior half more broadly rounded than posterior, dorsoventrally flattened with distinct hump on dorsal side without ornamentation, very flexible and high- ly contractile; 2 globular macronuclear nodules, micronuclei not observed; cortical granules ellipsoidal and colorless; 23 - 25 ventral kineties of which 3 or 4 preoral kineties; adoral zone of membranelles occupies about third of extended body length and consists of 40 - 48 adoral membranelles. Distribution. Benin , China , Germany , Mexico , USA , South Korea . Remarks. The Korean population of Peritromus faurei corresponds with the Chinese population studied by Song and Wilbert (1997) in most features. Up to date, there are only two species in the genus, P. faurei and P. kahli Villeneuve-Brachon, 1940 . Peritromus faurei differs from P. kahli mainly by the body size (≤100 μm vs.>100 μm), the number of somatic ciliary rows (20 - 26 vs. 25 - 50), the number of adoral membranelles (<50 vs.>60), and the ornamentation on dorsal side (absent vs. present) ( Borror, 1963 ; Dragesco and Dragesco-Kernéis, 1986 ; Carey, 1992 ; Song and Wilbert, 1997 ; Rosati et al. , 2004 ; Jin et al. , 2021 ). Voucher slides. One slide with protargol-impregnated specimens was deposited at the National Institute of Biological Resources, Korea (NIBRPR0000111065).