Cybaeus vanimaculatus Lee & Yoo & Kim 2021, sp. nov.

Cybaeus vanimaculatus sp. nov.

Figs 3, 5

Type material. Holotype: Male, 24 June 2020, Mt. Gubongdaesan, Beopheung-ri, Mureungdoweonmyeon, Yeongwol-gun, Gangwon-do, Korea (37°22'18" N, 128°15'46" E, alt. 471 m), leg. S. T. Kim (NIBR-QKVWIV 0000000036), Paratypes: 1 male, same data as holotype, leg S. T. Kim (NIBR-QKVWIV0000000043); 1 male, 29-July 2020, same location as holotype, leg. S. T. Kim (KKU-LEI-Ara20200624- CY004).

Etymology. The specific name is a compound word from the Latin ‘ vanus ’ meaning empty and ‘ maculatus ’ meaning spotted, referring to the patternless abdomen.

Diagnosis. The new species is most similar to Cybaeus enshu, Kobayashi, 2006 in the shape of the palpal organ, body appearance and number of peg setae on the PA, but can be easily distinguished from the latter by a cuticular spine on the retrolateral surface of the palpal tibia, the location of peg setae on the PA, and the shape of the conductor and the number of retromarginal teeth: males of C. vanimaculatus have a yellowish brown abdomen with no dorsal patterns (Fig. 3A), a long cuticular spine on the retrolateral surface of the palpal tibia (Figs. 3E, F), separated peg setae on the PA (Fig. 3H), 6 small and 5 large retromarginal teeth (Fig. 3B), and large and broad conductor with smooth tip (Fig. 3E, F), versus an pale abdomen without patterns, no cuticular spine on the retrolateral surface of the palapl tibia, clustered peg setae on the PA, 9 small and 2 large retromarginal teeth, and the small and narrow conductor with pointed tip in C. enshu (Kobayashi, 2006: p. 30, figs. 2–4). In addition, leg spination on the femur, tibia and metatarsus differs between the two species (Table 1).

Description. Male holotype. Total length 3.95. Carapace: 2.00 long / 1.38 wide, thin brown, head region slightly darker than thoracic region, suboval, cervical and radial furrows distinct, longitudinal fovea needle-shaped, head region slightly elevated, margin of thoracic region with faint blackish brown stripe (Fig. 3A). Eyes: AER 0.33, PER 0.41, AME 0.03, ALE 0.11, PME 0.08, PLE 0.09, AME-AME 0.01, AME-ALE 0.02, PME-PME 0.07, PME-PLE 0.05, AME-PME 0.08, ALE-PLE 0.03, all eyes on slightly raised eye tubercles, eye region infuscate, both eye rows slightly recurved from above. Chelicera: 0.95 long / 1.38 wide, thin brown with 3 promarginal teeth and 11 retromarginal teeth (6 small and 5 large) (Fig. 3B), lateral condyle present. Endite: 0.60 long / 0.45 wide, thin brown. Labium: 0.34 long / 0.27 wide, thin brown. Sternum: 1.02 long / 1.00 wide, thin brown, subcordate, convex, posterior end pointed protruding deeply between the coxae of leg IV (Fig. 3C). Legs: I 6.13 (1.89, 0.65, 1.24, 1.42, 0.93) / II 6.18 (1.80, 0.55, 1.32, 1.58, 0.93) / III 5.26 (1.55, 0.46, 1.27, 1.20, 0.78) / IV 6.83 (1.95, 0.50, 1.68, 1.78, 0.92), leg formula IV-II-I-III, pale brown, robust and strongly developed, no annuli, leg supination in Table 1. Abdomen: 1.90 long / 1.30 wide, light brown, ovoid, no pattern on dorsum, densely clothed with short blackish brown hair (Fig. 3A). Palp: 2.04 (0.72, 0.24, 0.35, -, 0.73), tibia longer than patella, thumb-like PA blunt and conspicuously protrudent with 3 peg setae (Fig. 3H), RTA modified very long and deep with a spine-like retrolateral cuticular projection, embolus long, slender and curved windingly, shorter than conductor, embolus tip wrapped by the PCo, conductor large auricle-shaped with broad ladle-like PCo, embolus parallel and separated from the margin of conductor, almost close to the PCo (Fig. 3D–G).

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

Remarks. The specimens of Cybaeus vanimaculatus were collected in a pitfall trap in mixed forest leaf litter near a mountain temple (alt. 471 m).