Cybaeus culter 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 culter

description: Cybaeus culter sp. nov.
Figs 2, 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), Paratype: 1 male, same data as holotype, leg. S. T. 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. 2E), blunt PA (Figs. 2E–G), 3 small and 4 large retromarginal teeth (Fig. 2B), and a narrow conductor base (Fig. 2E), 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. 2A). 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. 2B), 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. 2C). 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. 2A). 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. 2H), 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–G).
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).
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 461-463, DOI: 10.11646/zootaxa.4966.4.4, http://zenodo.org/record/4738778