INTRODUCTION
The genus Eschaneustyla, which was established by Stokes (1886), has not been reported in Korea. The three species, Eschaneustyla brachytona, E. lugeri and E. terricola are assigned to the genus Eschaneustyla (Berger 2006). The Eschaneustyla is distinguished with the characteristics of many frontal cirri in multicorona, more than two frontoterminal cirri, midventral complex composed of short row, transverse cirri absent from congeners (Berger 2006).
The genus Oxytricha was established by Bory de Saint Vincent in Lamouroux et al. (1824). To date, approximately 60 species have been recorded in the genus Oxytricha, about 20 of which were found in soil (Foissner & Adam 1983; Foissner 1996; Berger 1999; Paiva & Silva-Neto 2004; Deshmukh et al. 2012; Weisse et al. 2013; Shao et al. 2014).
Nine species of Oxytricha have been previously reported in South Korea - Hemiurosomoida longa (Gelei & Szabados, 1950), O. balladyna Song & Wilbert, 1989, O. fallax Stein, 1859, O. granuliferaFoissner & Adam, 1983, O. longigranulosa Berger & Foissner, 1989, O. marina Kahl, 1932, O. proximata Shibuya, 1930, O. rubripuncta Berger and Foissner, 1987 and O. saltans (Cohn 1866) Rees, 1881 (Shin and Kim 1993; The Korean Society of Systematic Zoology 1997; Kwon and Shin 2004, 2008, 2013; He and Choi 2015). Oxytricha species have the following common characteristics: frontoventral cirri in V-shaped pattern; two pretransverse ventral cirri and four to five transverse cirri; one right and left marginal row, four to six dorsal kineties; and caudal cirri present (Berger 1999).
In the current study, we identified two soil stichotrichs - Eschaneustyla lugeriFoissner, Agatha & Berger, 2002 and Oxytricha auripunctataBlatterer & Foissner, 1988. Our description is based on live observations and protargolimpregnated specimens. This is the first record of these two species in Korea.
MATERIALS AND METHODS
Sample collection, observation, and identification
Specimens of Eschaneustyla lugeri and Oxytricha auripunctata were collected from soil of land areas in Jeonju and Jeju, respectively. After the dried soil was transferred onto Petri dishes, supply clean water and stand at room temperature the minimum 6 hours.
We observed live and protargol-impregnated specimens using a light microscope (DM2500; Leica, Wetzlar, Germany) at magnifications of ×50 to ×1000. Protargol impregnation was performed according to the method of Foissner (1991). Classification and terminology follow those of Berger (1999, 2006).
RESULTS and REMARKS
Family Epiclintidae Wicklow & Borror, 1990 다전극하모과 (신칭)
Genus EschaneustylaStokes, 1886 에스카하모속 (신칭)
Eschaneustyla lugeriFoissner, Agatha & Berger, 2002 에스카하모충 (신칭) (Figs. 1, 2, Table 1)
Material examined: Ajoong-ri, Jeonju (38°48ʹN 127°10ʹE) in December 2014.
Diagnosis: Body elongate elliptical and often a very narrow posterior end, very flexible; size in vivo 170-230 μm×40- 60 μm (Figs. 1a, b, 2a, b); contractile vacuole at slightly upper middle of the left margin, two collecting canals (Figs. 1a, 2c); two types of colorless cortical granules present, circle to ellipse shape of large granules (type I, 1-1.5 μm in diameter) around cirri and dorsal bristles, small granules (type II, less than 0.5 μm) and crystals irregularly scattered (Figs. 1d, e, 2d-f); adoral zone of membranelles 27-35% of body length and 46-61 membranelles in protargol-impregnated specimens (Table 1, Figs. 1a, b, 2g, j); 48-67 macronuclear nodules, 3-8 micronuclei (Table 1, Figs. 1c, 2i); 27-47 frontal cirri, 3-5 buccal cirri, 35-59 frontoterminal cirri and 24-38 rightmost midventral cirri, transverse cirri absent, 1 right and 1 left marginal rows (Table 1, Figs. 1a, b, 2g); 4 dorsal kineties, 4-9 caudal cirri (Table 1, Figs. 1c, 2h, k, i).
Remarks: Before found in Korea, this rare species was only recorded from Taveuni Island, Fiji Island (Foissner 2002). In the Korean population, body size is smaller compared with that of the population of Fiji Island (Table 1). The major characteristics (body size, shape and pattern of ciliature) share with the Fiji population (Table 1). Eschaneustyla lugeri shows many frontal cirri forming multicorona which is the distinguishing feature of the family Epiclintidae. Eschaneustyla lugeri has only one midventral row, however, the other species of the genera, Eschaneustyla and Epiclintes have more than one midventral row (Berger 2006).
Habitat: Humus soil in the forest.
World distribution: Fiji Island and Korea.
Deposition: Two voucher slides with protargol-impregnated specimens are deposited in the National Institute of Biological Resources in Korea (NIBR000106558-NIBR000106559).
Collector: Dong-Ha Ahn.
Identifiers: Kang-San Kim, Gi-Sik Min.
Family Oxytrichidae Ehrenberg, 1830 첨모하모충과
Genus Oxytricha Bory de St. Vincent in Lamouroux, Bory de St. Vincent & Ddslongchamps, 1824 첨모하모충속
Oxytricha auripunctataBlatterer & Foissner, 1988 노란점첨모하모충 (신칭) (Figs. 3, 4, Table 2)
Material examined: Sarabong, Jeju (33°31ʹN 126°32ʹE) collected by Dong-Ha Ahn in October 2014.
Diagnosis: Body elliptical and both ends narrowly rounded, slightly flexible; size in vivo 75-95 μm×25-35 μm (Table 2, Figs. 3a, 4a); contractile vacuoles at left mid-body, two collecting canals (Figs. 3a, 4b, c); 0.5-1 μm in diameter orange yellowish cortical granules around cirri and dorsal bristles and irregularly scattered, 2-4 μm long yellowish crystals irregularly distributed (Figs. 3d, e, 4d-g); 11-16 μm×5-9 μm sized, 2 macronuclear nodules, 2 or 3 micronuclei in protargol- impregnated specimens (Figs. 3a, c, 4j); adoral zone of membranelles 28-34% of body length in protargol-impregnated specimens, 24-28 membranelles (Table 2, Figs. 3b, 4h); all cirri 10-12 μm long in vivo (transverse cirri, 15-17 μm long in vivo); 3 frontal cirri, 1 buccal cirrus, 4 frontoventral cirri, 3 postoral ventral cirri, 2 pretransverse ventral cirri, 3-4 transverse cirri, 1 right and 1 left marginal row (Table 2, Figs. 3a, b, 4h); 2 μm long in vivo dorsal cilia, 5 dorsal kineties with several basal bodies, 3 caudal cirri (Table 2, Figs. 3c, 4i).
Remarks: In the Korean population, body size is smaller than compared with the Australian population (Table 2). Oxytricha auripunctata has orange-yellowish cortical granules which differ from those of other Oxytricha species. Oxytricha auripunctata differs from O. rubripuncta in the following characteristics: body size in vivo (120-160 μm× 40-60 μm vs. 75-95 μm×25-35 μm); color of cortical granules (reddish vs. orange-yellowish) (Berger 1999).
Habitat: Humus soil under mosses.
World distribution: Australia, Costa Rica and Korea.
Deposition: Two voucher slides with protargol-impregnated specimens are deposited in the National Institute of Biological Resources in Korea (NIBR000106566-NIBR000106567).
Collector: Dong-Ha Ahn.
Identifiers: Kang-San Kim, Gi-Sik Min.