Cybaeus culter, Lee & Yoo & Kim, 2021

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

publication ID

https://doi.org/10.11646/zootaxa.4966.4.4

publication LSID

lsid:zoobank.org:pub:62FE9E52-E3F2-4484-800D-61D916872A5A

DOI

http://doi.org/10.5281/zenodo.4738794

persistent identifier

http://treatment.plazi.org/id/821A3D25-7F6B-472B-AE9E-0A394758CE15

taxon LSID

lsid:zoobank.org:act:821A3D25-7F6B-472B-AE9E-0A394758CE15

treatment provided by

Plazi

scientific name

Cybaeus culter
status

sp. nov.

Cybaeus culter   sp. nov.

Figs 2 View FIGURE 2 , 5 View 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. T GoogleMaps   . 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 View FIGURE 2 ), blunt PA ( Figs. 2E–G View FIGURE 2 ), 3 small and 4 large retromarginal teeth ( Fig. 2B View FIGURE 2 ), and a narrow conductor base ( Fig. 2E View 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. 2A View 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. 2B View 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. 2C View 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. 2A View 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. 2H View 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–G View 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).

T

Tavera, Department of Geology and Geophysics

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Cybaeidae

Genus

Cybaeus