<i>Drassyllus yaginumai</i> Kamura, 1987 and <i>Zelotes tortuosus</i> Kamura, 1987 belonging to Gnaphosidae were captured by pitfall trap in maize and soybean fields during the survey of arthropod fauna of agricultural ecosystem in Korea. Present work describes these 2 species with illustrations of taxonomic characters.
Gnaphosid spider fauna of Korea comprises 48 species in 20 genera to date [
The external morphology of D. yaginumai and Z. tortuosus was examined and illustrated taxonomic characters using a stereoscopic dissecting microscope. Measurements were made with an ocular micrometer and are recorded in millimeters. Leg measurements are given as “leg number, total length (femur, patella, tibia, metatarsus, and tarsus)”. Pedipalp measurements are listed as “total length (femur, patella, tibia, tarsus)”. The following abbreviations are used in the description: AME, anterior median eye; ALE, anterior lateral eye; PME, posterior median eye; PLE, posterior lateral eye; MEs, median eyes; Les, lateral eyes; AER, anterior eye row; PER, posterior eye row; MOQ, median ocular quadrangle. The specimens studied are lodged in the deposited in National Institute of Biological Resources (NIBR) of the ministry of Environment, Korea.
Genus Drassyllus Chamberlin, 1922 [
Carapace ovoid; truncated posteriorly, narrowed anteriorly; clypeus low. Both eye row procurved in front. Chelicerae with 4 - 5 promarginal teeth and 2 - 3 retromarginal teeth. Legs stout; tarsi IV with sparse scopula. Abdomen oval; anteriodorsallyscutum in male. Male palp with retrolateraltibialapophysis; terminal apophysis situated near middle. Female epigynum usually with median septum and distinct curved anterior margin.
Drassyllus yaginumai Kamura, 1987 (Korean name: Yaginumachammaegeomi)
Drassyllus yaginumai Kamura, (1987a) [
Measurements. Female: Body length 6.52, Carapace length 2.80/width 2.12, Abdomen length 3.72/width 2.35, Cheicera length 0.75/width 0.34, Endite length 0.76/width 0.35, Labium length 0.59/width 0.48, Sternum length 1.63/width 1.30, Anterior eye row 0.60, Posterior eye row 0.72, Legs: I 7.97 (2.10, 1.28, 1.78, 1.56, 1.25), II 6.99 (1.80, 1.15, 1.52, 1.35, 1.17), III 6.09 (1.62, 0.90, 1.16, 1.47, 0.94), IV 8.06 (2.48, 1.18, 2.05, 2.35, 1.10), Pedipalp 2.87 (1.04, 0.40, 0.50, 0.93).
Description. Female: Caparace longer than wide, reddish brown, thoracic region slightly raised, cervical, radial and median groove dark reddish brown and distinct, fovea needle shaped (
Specimen examined. 1 female, 11-VII-2012, Chilseong-myeon, Goesan-gun, Chungcheongbuk-do, ST Kim and SY Lee leg.
Ecological remarks. This species inhabits in the maize fields and is collected by pitfall trap.
Distribution. Korea (newly recorded), Japan.
Genus Zelotes Gistel, 1848 [
Carapace oval covered with fine hairs; narrowed in front. Anterior eye row slightly procurved, posterior row straight in front. Chelicerae with black hairs on prolateral side; promargin with 3 - 4 teeth and one row of bristles, retromargin with 1 - 4 denticles. Legs relatively long; tibiae and metatarsi III and IV usually with ventral spines; metatarsi with scopulae. Abdomen long oval; anteriodorsallyscutum in male. Male palp with retrolateraltibialapophysis; usually with terminal apophysis and median apophysis. Female epigynum usually with distinct groove-like anterior and lateral margins.
Zeltotes tortuosus Kamura, 1987b (Korean name: Geomeunyeomrageomi)
Zelotes davidi Yaginuma, 1986 [
Measurements. Male: Body length 4.92, Carapace length 2.34/width 1.77, Abdomen length 2.58/width 1.50, Cheicera length 0.65/width 0.30, Endite length 0.54/width 0.28, Labium length 0.30/width 0.30, Sternum length 1.42/width 1.00, Anterior eye row 0.28, Posterior eye row 0.34, Legs: I 6.29 (1.94, 1.02, 1.28, 1.15, 0.90), II 5.34 (1.50, 0.92, 1.07, 1.05,0.80), III 4.83 (1.28, 0.82, 0.78, 1.20, 0.75), IV 7.41 (2.10, 0.97, 1.35, 1.94, 1.05),
Pedipalp 2.44 (0.92, 0.30, 0.29, 0.93).
Description. Male: Caparace longer than wide, dark blackish brown, cervical groove indistinct, fovea indistinct needle shaped, radial groove visible faintly, thoracic region slightly convex (
Eight eyes, AER strongly recurved, PER almost straight, AMEs black, ALEs white, PMEs semicircle in shape, MOQ slightly wider posteriorly (
Male palp with long and thick retrolateraltibial apophysis, digiti form (
Specimen examined. 1 male, 13-IX-2012, Samgi-myeon, Gokseong-gun, Cheollanam-do, ST Kim and SY Lee leg.
Ecological remarks. This species inhabits in the soybean fields and is collected by pitfall trap.
Distribution. Korea (newly recorded), Japan.
This research was supported by National Institute of Biological Resources (New and unrecorded species discovery project 2012) and National Institute of Environmental Research (Project # 20130619445) of the Ministry of Environment, Korea, and the Brain Korea 21 project from Seoul National University.