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 Clubiona Latreille, established in 1804 based on the Clubiona pallidula (Clerck, 1757), distributed worldwide, is the largest genus of the family Clubionidae. A total of 581 species of 16 genera belonging to this family have been described to date (Platnick, 2012). Clubiona, which is known 366 species worldwide, is the only genus described from Korea and twenty-four species are represented by this genus to date in Korea (Namkung et al., 2009) ; Clubiona coreana Paik, 1990, Clubiona diversa O. P.-Cambridge, 1862, Clubiona haeinsensis Paik, 1990, Clubiona hwanghakensis Paik, 1990, Clubiona irinae Mikhailov, 1991, Clubiona japonicola Bösenberg & Strand, 1906, Clubiona jucunda (Karsch, 1879), Clubiona kasanensis Paik, 1990, Clubiona kimyongkii Paik, 1990, Clubiona kurilensis Bösenberg & Strand, 1906, Clubiona lena Bösenberg & Strand, 1906, Clubiona lutescens Westring, 1851, Clubiona mandschurica Schenkel, 1953, Clubiona mayumiae Ono, 1993, Clubiona neglectoides Bösenberg & Strand, 1906, Clubiona odesanensis Paik, 1990, Clubiona papillata Schenkel, 1936, Clubiona phragmitis C. L. Koch, 1843, Clubiona pseudogermanica Schenkel, 1936, Clubiona rostrata Paik, 1985, Clubiona sopaikensis Paik, 1990, Clubiona subtilis L. Koch, 1867, Clubiona venusta Paik, 1985 and Clubiona vigil Karsch, 1879. Members of Clubiona are particularly diverse in the foliage layer of primary and secondary forests including agricultural ecosystems. Clubiona zacharovi was erected by Mikhailov (1991) based on the male collected from Maritime Province, Kedrovaya Pad Reserve, Russia. Though he denoted that this species may be found in Northeast China and Korea without examining specimen, actual existence  of this species was not confirmed from Korea to date. In this paper, authors present a description of the first female of this species collected from Mt. Myeongji, Gyeonggi-do in Korea in the course of survey on the spider fauna of this area. The external morphology of the specimens was observed and female epigynum and genitalia were illustrated using a stereoscopic microscope, and metric characters were measured with an ocular micrometer. Female genitalia was illustrated after dissolving extraneous tissue with 10% KOH solution for 24 h. All measurements are given in mm. Leg measurements are given in the order of femur, patella+tibia, metatarsus and tarsus in parentheses. Specimen (#ARAPIV0000174008) is lodged in the collection of National Institute of Biological Resources, Korea (NIBR).

Taxonomic accounts

    Order Araneae Clerck, 1757
    Clubionidae Wagner, 1887
    Clubiona Latreille, 1804
    Clubiona zacharovi Mikhailov, 1991
    (Figs. 1a-c)
    Clubiona zacharovi Mikhailov, 1991: p. 226, f. 52-53
    Clubiona sp. (A) Namkung, 2001: p. 452, f. 34-30a-b

 Diagnosis Female of C. zacharovi is distinguished from other members in the genus Clubiona by details of the internal structure of the epigyne. Epigynal plate slightly sclerotized, covered with stout hairs. A pair of elliptical spermathecae visible through the cuticle covering them. Epigynal plate protruded as V-shaped around paired spermathecae. Paired large circular copulatory openings distinct with dark margin, disposed at the hind part of the epigynal plate.

 Measurements Body length 8.52, Carapace length 3.73; width 2.49, Abdomen length 4.90; width 2.98, Cheicera length 1.63; width 0.92, Endite length 1.49; width 0.85, Labium length 1.07; width 0.50, Sternum length 1.92; width 1.28, Anterior eye row 1.07, Posterior eye row 1.49, Legs : I 8.21 (2.49, 3.27, 1.49, 0.96), II 8.63 (2.56, 3.48, 1.70, 0.89), III 7.46 (2.20, 2.77, 1.78, 0.71), IV 10.65(3.05, 3.41, 3.27, 0.92), Pedipalp 3.02 (1.03, 1.07, - , 0.92).

 Description Female: Carapace yellowish brown, longer than wide (52:35). Head region a little raised. Median groove needle-shaped and distinctive. Cervical and radial groove indistinct (Fig.1a). Chelicera dark reddish brown with 6 promarginal teeth and 4 retromarginal teeth. Endite yellowish brown. Labium brown, longer than wide (21:10). Legs yellowish brown. Patella, tibia and metatarsus dark brown. Leg formula 4-2-1-3. Leg formula index 100:81:77:70. The femoral spine formula 1-1-2 in I and II, and 2-2-2 in III and IV. Dorsum reddish brown with long longitudinal cardiac pattern and many long hairs on edge of the anterior part, 3-4 pairs of arrow feather patterns and 5-6 rows of horizontal patterns on the posterior part. Paired large circular copulatory openings distinct with dark margin, disposed at the hind part of the epigynal plate (Fig. 1b, c).

Fig. 1. Clubiona zacharovi Mikhailov, 1991 (a: female wandering in the plant litters, b: female epigynum, ventral view, c: female genitalia, dorsal view).

Male: See Mikhailov (1991); p. 226, f. 52-53.
Specimen examined 1 female, 13-V-1995, Mt. Myeongji, Gapyeong-gun, Gyeonggi-do, Seung Tae Kim and Joon Namkung Leg (#ARAPIV0000174008 of NIBR).
Ecological remarks This species lives in the plant litter or under the stone in mountain sites.
Distribution Korea (newly recorded), Russia

Acknowledgement

 Authors gratefully acknowledge the confirming species of Dr. Mihkailov at the Zoological Museum MGU in Russia by comparing his collection, original descriptor of this species. This research was supported by grants from new and unrecorded species discovery project by National Institute of Biological Research, the Ministry of Environment, Korea and the Brain Korea 21 Project.