Cybaeus yeongwolensis Lee & Yoo & Kim 2021, sp. nov.
Creators: name: Lee, Sue Yeon
name: Yoo, Jung Sun
name: Kim, Seung Tae
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Cybaeidae
Cybaeus
Cybaeus yeongwolensis

description: Cybaeus yeongwolensis sp. nov.
Figs 1, 5
Type material. Holotype: Male, 24 August 2020, Naedeok-ri, Sangdong-eup, Yeongwol-gun, Gangwon-do, Korea (37°06'58" N, 128°45'00.5" E, alt. 344 m), leg. S. T. Kim (NIBR-QKVWIV0000000034), Paratypes: 6 males, same data as holotype, leg. S. T. Kim (NIBR-QKVWIV0000000037–42); 2 males, same data as holotype, leg. S. T. Kim (KKU-LEI-Ara20200824- CY001–2).
Etymology. The species name is derived from the type locality, Yeongwol-gun.
Diagnosis. The new species is most similar to Cybaeus culter sp. nov. in the shape of the palpal organ and body appearance, but can be easily distinguished from the latter by the number of peg setae on the PA, the shape of the RTA, and the number and size of the retromarginal teeth: males of C. yeongwolensis have 21 peg setae on the PA (Fig. 1H), a slightly anteriorly protruding RTA in ventral view (Fig. 1E), and 4 small and 4 large retromarginal teeth (Fig. 1B), versus 13 peg setae (Fig. 2H), a strongly anteriorly protruding RTA (Fig. 2E), and 3 small and 4 large retromarginal teeth (Fig. 2B) in C. culter. In addition, leg spination on the femur, tibia and metatarsus differs between the two species (Table 1).
Description. Male holotype. Total length 4.13. Carapace: 2.24 long / 1.67 wide, dusky blackish brown, head region darker than thoracic region, oval, cervical and radial furrows distinct, longitudinal fovea needle-shaped, head region slightly elevated (Fig. 1A). Eyes: AER 0.40, PER 0.58, AME 0.04, ALE 0.11, PME 0.06, PLE 0.10, AME-AME 0.05, AME-ALE 0.04, PME-PME 0.13, PME-PLE 0.08, AME-PME 0.10, ALE-PLE 0.05, all eyes on slightly raised eye tubercles, eye region infuscate, AER slightly recurved and PER almost straight from above. Chelicera: 0.61 long / 0.31 wide, pale blackish brown with 3 promarginal teeth and 8 retromarginal teeth (4 small and 4 large) (Fig. 1B), lateral condyle present. Endite: 0.58 long / 0.33 wide, pale blackish brown. Labium: 0.27 long / 0.30 wide, pale blackish brown. Sternum: 1.00 long / 0.99 wide, pale blackish brown, subcordate, convex, posterior end pointed protruding slightly between the coxae of leg IV (Fig. 1C). Legs: I 7.85 (1.97, 0.78, 2.10, 1.82, 1.18) / II 5.94 (1.22, 0.72, 1.53, 1.47, 1.00) / III 5.33 (1.50, 0.65, 1.00, 1.33, 0.85) / IV 7.66 (1.80, 0.63, 2.25, 1.87, 1.11), leg formula I-IV-II-III, thick yellowish brown, robust and strongly developed, no annuli, leg supination in Table 1. Abdomen: 1.85 long / 1.51 wide, dark blackish brown, ovoid, two pairs of pale spots and five chevrons on dorsum, densely clothed with short blackish brown hair (Fig. 1A). Palp: 2.60 (0.89, 0.38, 0.30, -, 1.03), tibia shorter than patella, PA blunt and protrudent 21 peg setae (Fig. 1H), RTA modified long and moderately shallow, slightly protrudent anteriorly in ventral view, embolus long and slender, shorter than conductor, conductor banana-shaped with pointed PCo, embolus parallel and slightly separated from the margin of conductor, almost close to the PCo (Figs. 1D–G).
Distribution. Korea (Naedeok-ri, Yeongwol-gun, Gangwon-do). Only known from the type locality.
Remarks. The specimens of Cybaeus yeongwolensis were collected in a pitfall trap in leaf litter along the roadside of a hilly mixed forest (alt. 344 m).
description: Published as part of Lee, Sue Yeon, Yoo, Jung Sun & Kim, Seung Tae, 2021, Four new epigean spiders of the genus Cybaeus (Araneae: Cybaeidae) from South Korea, pp. 458-468 in Zootaxa 4966 (4) on pages 460-461, DOI: 10.11646/zootaxa.4966.4.4, http://zenodo.org/record/4738778