Cybaeus culter,

Lee, Sue Yeon, Yoo, Jung Sun & Kim, Seung Tae, 2021, Four new epigean spiders of the genus Cybaeus (Araneae: Cybaeidae) from South Korea, Zootaxa 4966 (4), pp. 458-468: 461-463

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Cybaeus culter

sp. nov.

Cybaeus culter  sp. nov.

Figs 2View FIGURE 2, 5View FIGURE 5

Type material. Holotype: Male , 04 September 2020, Mt. Samdongsan , Deokgu-ri , Sangdong-eup , Yeongwol-gun, Gangwon-do, Korea (37°05'54.4" N, 128°47'44.8" E, alt. 289 m), leg. S. T. Kim ( NIBR-QKVWIV0000000035)GoogleMaps  , Paratype: 1 male, same data as holotype, leg. S. TGoogleMaps  . Kim (KKU-LEI-Ara20200904- CY003)  .

Etymology. The species name is derived from the Latin noun ‘ culter  ’ meaning knife, referring to the linear and sharp edge of the RTA on the male palp.

Diagnosis. The new species is similar to Cybaeus yeongwolensis  sp. nov. and Cybaeus jiriensis Seo, 2016  in the shape of the palpal organ and body appearance. Distinguishing C. culter  and C. yeongwolensis  is discussed in the diagnosis of C. yeongwolensis  . C. culter  can be distinguished from C. jiriensis  by the shape of RTA, PA and conductor, and the number and size of retromarginal teeth: males of C. culter  have a roundly protruding anterior part of RTA ( Fig. 2EView FIGURE 2), blunt PA ( Figs. 2E–GView FIGURE 2), 3 small and 4 large retromarginal teeth ( Fig. 2BView FIGURE 2), and a narrow conductor base ( Fig. 2EView FIGURE 2), versus a smooth anterior part of RTA, rather pointed PA, 8 small retromarginal teeth and broad conductor base in C. jiriensis  ( Seo, 2016: p. 114, fig. 2a–c). In addition, leg spination on the femur, tibia and metatarsus differs among the three species ( Table 1).

Description. Male holotype. Total length 4.94. Carapace: 2.72 long / 1.90 wide, brown, head region slightly darker than thoracic region, oval, cervical and radial furrows distinct, longitudinal fovea needle-shaped, head region slightly elevated, margin of thoracic region with faint black stripe ( Fig. 2AView FIGURE 2). Eyes: AER 0.49, PER 0.62, AME 0.07, ALE 0.14, PME 0.08, PLE 0.08, AME-AME 0.06, AME-ALE 0.05, PME-PME 0.14, PME-PLE 0.09, AME-PME 0.14, ALE-PLE 0.06, all eyes on slightly raised eye tubercles, eye region infuscate, AER slightly recurved and PER almost straight from above. Chelicera: 1.08 long / 0.50 wide, brown with 3 promarginal teeth and 7 retromarginal teeth (3 small and 4 large) ( Fig. 2BView FIGURE 2), lateral condyle present. Endite: 0.60 long / 0.45 wide, pale brown. Labium: 0.43 long / 0.40 wide, thin brown. Sternum: 1.30 long / 1.15 wide, pale blackish brown, subcordate, convex, posterior end pointed protruding slightly between the coxae of leg IV ( Fig. 2CView FIGURE 2). Legs: I 8.08 (2.20, 0.72, 2.16, 1.83, 1.17) / II 7.08 (1.90, 0.65, 1.77, 1.66, 1.10) / III 6.04 (1.64, 0.70, 1.25, 1.48, 0.97) / IV 7.59 (2.13, 0.70, 1.98, 2.00, 0.78), leg formula I-IV-II-III, pale brown, robust and strongly developed, femur, tibia and metatarsus with two thick annuli, leg supination in Table 1. Abdomen: 2.10 long / 1.72 wide, dark blackish gray, ovoid, two pairs of pale spots and five chevrons on dorsum, densely clothed with short blackish brown hair ( Fig. 2AView FIGURE 2). Palp: 2.61 (0.94, 0.33, 0.30, -, 1.04), tibia slightly shorter than patella, PA blunt and protrude with 13 peg setae ( Fig. 2HView FIGURE 2), RTA modified long and moderately shallow, strongly protrude anteriorly in ventral view, embolus long and slender, shorter than conductor, conductor auricle-shaped with pointed PCo, embolus parallel and separated from the margin of conductor, almost close to the PCo ( Figs. 2D–GView FIGURE 2).

Distribution. Korea (Mt. Samdongsan, Yeongwol-gun, Gangwon-do). Only known from the type localty.

Remarks. The specimens of Cybaeus culter  were collected in a pitfall trap in mixed forest leaf litter in a mountain valley (alt. 289 m).


Tavera, Department of Geology and Geophysics