Further studies on water mites from Korea, with description of two new species (Acari, Hydrachnidia) Author Pesic, Vladimir Author Semenchenko, Ksenia A. Author Lee, Wonchoel text ZooKeys 2015 507 1 24 http://dx.doi.org/10.3897/zookeys.507.9973 journal article http://dx.doi.org/10.3897/zookeys.507.9973 1313-2970-507-1 025CF60F8141423889CF21A48C98314C 025CF60F8141423889CF21A48C98314C Taxon classification Animalia Trombidiformes Sperchonidae Sperchon (Sperchon) orientalis Tuzovskij, 1990 Fig. 3 Sperchon orientalis Tuzovskij 1990 : 99. Synonymy. Material examined. SOUTH KOREA: CR20 Chungcheongbuk Province, Mt. Vorak, Deokjusanseong, stream, 36°51.705'N , 128°06.030'E , 25.v.2013 Pesic & Karanovic 2/1/0 (1/0/0 mounted). Remarks. The specimens examined from South Korea matches the general morphology of Sperchon orientalis Tuzovskij, 1990, a species described from the Primory Territory in the Russian Far East ( Tuzovskij 2008 ). Due to the general shape of idiosoma (Cx-I medially separated, excretory pore surrounded by a sclerotized ring, see Fig. 3B) and palp (P-4 ventral setae strongly developed and projecting, dividing this segment in three equal parts in size, Fig. 3 C-D ), Sperchon orientalis closely resembles Sperchon glandulosus Koenike, 1886, from which it differs by the eye capsule longer than diameter of Postoc., a higher number of dorsal setae on P-2 and -3 and less densely arranged dorsal setae on IV-L-3-5 ( Tuzovskij 2008 ). Figure 3. Sperchon orientalis Tuzovskij, 1990, male, Deokjusanseong, Korea ( A-B photograph, C-F line drawing): A idiosoma, dorsal view B idiosoma, ventral view C palp, lateral view D palp, medial view. Scale bar = 100 μm ( C-D ). Chung and Kim (1991) reported and illustrated Sperchon fluviatilis Uchida, 1934 from Korea. However, the excretory pore in Sperchon fluviatilis is smooth (see Uchida 1934 , fig. 12-13), not sclerotized as in the illustrated male specimen from Korea. As their illustrations ( Chung and Kim 1991 : fig. 3 A-D ) show a general conformity with Sperchon orientalis , it is likely that the specimens attributed to Sperchon fluviatilis refer to Sperchon orientalis . Distribution. Far East of Russia, eastern Siberia ( Tuzovskij 2008 ; Semenchenko et al. 2010 ). New for the fauna of Korea.