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 13. Paraspathidium apofuscum Long, Song, Al-Rasheid & Gong, 2009 ( Fig. 13 ) Material examined. Brackish water with seaweed (salinity, 20‰) collected from Gunsuncheon Stream , Gangdong-myeon , Gangneung-si , Gangwon-do , Korea ( 37° 44′27″N 128°59′2″E ) on 1 May 2019 . Diagnosis. Body size about 150 × 45 μm in vivo , 161- 207 × 40-52 μm after protargol impregnation (n = 6); body contractile, elongated elliptical with slightly bulged oral part; posteriorly located contractile vacuole with 2 distinct collecting canals; cytoplasmic extrusomes scattered throughout body, 6-8 μm in length; cortex punctate by deep ciliary pits; 2 macronuclear nodules; 34-47 monokinetidal somatic kineties with few dikinetids anteriorly; single circumoral kinety; perioral kinety opened and disturbed 3 brush rows. Distribution. China and Korea . Remarks. The Korean P. apofuscum population differs from the Chinese population in the presence (vs. absence) of the contractile vacuole’s canals ( Long et al. , 2009 ). Paraspathidium apofuscum is different from P. fuscum (Kahl, 1928) Fjeld, 1955 in the number of somatic kineties (34-47 vs. 50-60), the presence (vs. absence) of the dorsal brush, and the opened (vs. closed) perioral kinety ( Long et al. , 2009 ). Voucher slides. Two slides with protargol-impregnated specimens were deposited at National Institute of Biological Resources (NIBRPR0000110199, NIBRPR0000110 200).