Freshwater bryozoans of Korea-observations on living colonies and three new records Author Chae, Hyun Sook Department of Life Science, Woosuk University, Jincheon 27841, Republic of Korea Author Kil, Hyun Jong National Migratory Birds Center, National Institute of Biological Resources, Incheon 22689, Republic of Korea Author Seo, Ho Jin Yang and Ji Eun text Journal of Species Research 2024 13 1 50 60 journal article 10.12651/JSR.2024.13.1.050 2713-8615 13161977 5. Plumatella casmiana Oka, 1907 ( Fig. 5 ) ṻċḑẍūḓ끼ḇNj Material examined. Dongrim Reservoir, 10 July 2015 ; Chopyeong Reservoir, 2 August 2016 ; Baekgok Reservoir, 30 September 2016 . Substratum. Wood and plastic. Remarks. We collected the colony and two different statoblasts, leptoblasts, and sessoblasts, for the first time since Toriumi (1941) reported from the Korea . Colony is light brown to sandish in color, short branched and entirely attached to substratum ( Fig. 5A ). Leptoblast unique to Pl. casmiana ( Wood and Okamura, 2005 ) is elliptical, 288-320 μm long and 124-155 μm wide, with length/ width ratio of about 2.2 ( Fig. 5B ), lacks the internal capsule, and has shallow tubercles on the surface and narrow annulus. Sessoblast is tuberculated weakly on the surface, but nearly smooth. It is 341-345 μm long and 234-241 μm wide, with length/width ratio of about 1.4 and narrow and smooth annulus ( Fig. 5C, D ). Fig. 6. Plumatella fungosa (Pallas, 1768) . A, Dorsal view, flatoblast; B, Ventral view, flatoblast; C, Annulus and fenestra in detail; D, Sessoblast. Scale bars: A, B, D = 100 μm, C = 30 μm. Distribution. Korea and Cosmopolitan.