Rilaena kaschkataschica Snegovaya sp. nov.

(Fig. 2)

Material. Holotype: 1♂ (ZMMU), Republic of Kabardino-Balkaria, Adyl-Su River valley, Kashkatash Glacier foreland, 153 years old site [Line IX], 2277 m a.s.l., 43.217998° N, 42.685711° E, mature pine forest with Hedysarum sp. and mosses, in barber pitfall, 19.07.2023, leg. O.L. Makarova ; Paratypes: 2♂♂, 4♀♀, 5 juv. (RCNS), same place with Holotype; 1♀ (ZMMU), same place, 91 years old site [Line VI], 2385 m a.s.l., 43.213850° N, 42.686481° E, sloping birch forest with forb grasses, 15− 22.07.2023, leg. O.L. Makarova.

Description. The body is square shaped, with a pointed back. The body color is sandy with dark brown spots and a distinct dark brown saddle-shaped pattern (Fig. 2A). Body length 4.0 mm long, 2.4 mm width. The eye mound is slightly trapezoidal with 10 small denticles (Fig. 2B). Leg Fe I fusiform, all leg Fe with transverse rows of denticles (Fig. 2C). Lengths of leg segments: I: 2.5+1.0+2.6+3.0+5.0 = 14.1; II: 5.5+1.5+4.6+5.4+ 6.7 =23.7; III: 3.7+1.2+3.0+4.0+5.0= 16.9; IV: 5.0+1.4+3.6+6.2+7.2 =23.4. Fe pedipalps dorsally and ventrally with black-tipped denticles, dorsally also with large teeth. Pa and Ti with apophyses completely covered with setae, Ta with setae, laterally with microdenticles (Figs. 2D–E). Pedipalp lengths 1.5+1.1+1.0+1.8 =5.4. Male chelicerae dorsally with several denticles, the other parts with setae (Figs. 2F–G). Cheliceral basal segment length 1.5, distal segment 1.6. The penis with a wide base, narrows towards the middle and then widens closer to the glans, wings not wide (Figs. 2I–K).

The female differs from the male in larger body sizes and a rounded body shape (Fig. 2L). The female has wider and rounded apophyses on the pedipalp, while the male has pointed ones (Figs.2M–N).The male has larger chelicerae. Female body length 7.0, wide 4.0. Pedipalp lengths 1.5+0.8+0.8+1.8 =4.9. Cheliceral basal segment length 1.3, distal segment 1.8 (Figs. 2 O-P). Lengths of leg segments: I: 3.0+1.0+2.5+3.0+4.4 =13.9; II: 4.0+1.2+4.0+5.0+8.4 =22.6; III: 2.6+1.0+2.2+4.0+4.2 =14.0; IV: 4.2+1.4+3.5+5.0+5.6 =19.7.

Diagnosis. A new species most closely related to the Rilaena caucasica Snegovaya et Tchemeris, 2016, but different from it the structure of the penis— R. caucasica has more rounded and wider penis wings (Figs. 2 I–K; Snegovaya & Tchemeris, 2016: Figs. 1 M–O).

Etymology. The species is named after the Kashkatash Glacier in Kabardino-Balkaria (Russia).

Distribution. Known only from the type locality in Republic of Kabardino-Balkaria (Russia).