Unrecorded species of Korean protozoans discovered through the project of ‘ Discovery of Korean Indigenous Species’ III Author Chae, Kyu-Seok Department of Biological Sciences and Bioengineering, Inha University, Incheon 22212, Republic of Korea & Department of Biological Sciences, Inha University, Incheon 22212, Republic of Korea Author Kim, Kang-San Insect & Invertebrate Research Team, Research Center for Endangered Species, National Institute of Ecology, Author Jung, Jongwoo Department of Science Education, Ewha Womans University, Seoul 03760, Republic of Korea jongwoo@ewha.ac.kr Author Min, Gi-Sik Department of Biological Sciences and Bioengineering, Inha University, Incheon 22212, Republic of Korea & Department of Biological Sciences, Inha University, Incheon 22212, Republic of Korea jongwoo@ewha.ac.kr text Journal of Species Research 2023 12 4 355 361 journal article 10.12651/JSR.2023.12.4.355 2713-8615 13163117 4. Difflugia amphoralis Cash & Hopkinson, 1909 ( Fig. 1D ) 입ḣū"ḽDzȒNj ( ṵÿ ) Difflugia amphoralis Cash & Hopkinson, 1909 Material examined. Jeju-si ( 33°28′29″N , 126°35′50″E ), Jeju-do , South Korea ; 25 June 2021 . Deposition. NIBRPR0000111162. World distribution. Cosmopolitan. Diagnosis. Shell transparent, short pear shaped, base of fundus pointed; mouth round, surrounded by a rim of sand grains. Shell length 80 μm, width 49 μm; mouth diameter 24 μm. Remarks. This specimen is slightly smaller than previous descriptions.