Acantholycosa sidorovi, Fomichev, 2021

Acantholycosa sidorovi View in CoL sp. n.

Figs 16–17 View FIGURES 10–19 , 24–27, 34–35, 60–62, 75–76

Types. RUSSIA: Altai Krai: holotype ♂ ( ISEA, 001.8653), Tigirek Mt. Range , without precise locality and date, collector unknown (donated by V. V. Sidorov) ; paratypes: 1♂ ( ISEA, 001.8654), 1♀ ( ISEA, 001.8724), together with the holotype; 2♂ 1♀ ( ISEA, 001.8655), Tigirek Mt. Range, the upper reaches of Babii Klyuch River , 51°03’N, 82°58’E, 1400–1500 m, 9.07.2016, collector unknown (donated by V. V. Sidorov) GoogleMaps .

Etymology. The specific name is a patronym given in honor of my friend, Vladislav V. Sidorov (Barnaul, Russia), who donated the types of the new species.

Diagnosis. The new species is closely related to A. altaiensis , which is also known from the Western Altai. Both species have a spine ( Sp) near base of the embolus ( Em), laminar apical arm ( Aa) of the tegular apophysis ( Tg) and diamond-shaped epigynal fovea ( Fo) with pentagonal septal base ( Sb). The male of A. sidorovi sp. n. differs by the enlarged and more curved paleal outgrowth ( Po), more prominent spine near base of the embolus (in retrolateral view) and by underdeveloped apical arm of the tegular apophysis (cf. Figs 25, 27, 34 and figs 2, 4, 6 in Marusik et al. 2004). The female of the new species can be separated from the female of A. altaiensis by the apical pocket ( Ap) almost as wide as the epigynal fovea (vs. significantly narrower) and by the longer and thinner receptacles ( Re, cf. Figs 60, 62 View FIGURES 54–62 and figs 8–9 in Marusik et al. 2004).

Description. Male ( holotype). Total length 7.5. Carapace: 3.8 long, 3.2 wide. Coloration. Carapace dark brown. Eye field almost black. Chelicerae, sternum and palps brown. Labium, endites and coxae yellow-gray. Legs yellowbrown. Femora of legs with brown transverse stripes and longitudinal yellow stripes. Abdomen yellow-brown dorsally. Cardiac mark almost indistinct. Venter of the abdomen yellow-gray. Spinnerets dark gray. Spination of leg I: Fe d1-1-1 p0-0-2 r0-1-1; Ti p1-0-0 r1-0-0 v2-2-2-2-1-2; Mt p1-1-0 r0-1-0 v2-2-0. Leg measurements: I 4.4, 1.7, 4.2, 4.6, 1.8 (16.7); II 4.3, 1.7, 4.0, 4.7, 1.85 (16.55); III 4.2, 1.55, 3.6, 5.45, 1.85 (16.65); IV 4.9, 1.6, 4.3, 6.3, 1.55 (18.65).

Palp as in Figs 16–17 View FIGURES 10–19 , 24–27, 34–35. Tegular apophysis almost square, with a poorly developed basal arm ( Ba). Palea ( Pl) rounded. Paleal outgrowth strongly bent. Terminal apophysis ( Ta) straight, spine-like. Embolus with a semicircular notch in the distal part.

Female. Total length 8.7. Carapace: 3.4 long, 2.75 wide. Coloration. Carapace dark brown. Eye field almost black. Chelicerae, sternum and labium brown. Endites and coxae yellow-gray. Legs and palps yellow-gray with brown annulation. Abdomen brown-gray dorsally. Cardiac mark dark brown. Venter of the abdomen yellow. Spinnerets yellow-gray. Spination of leg I: Fe d1-1-1 p0-0-2 r0-0-1; Ti p1-0-0 r1-0-0 v2-2-2-2-1-2; Mt p0-1-0 r0- 1-0 v2-2-0. Leg measurements: I 3.15, 1.45, 2.8, 2.75, 1.35 (11.5); II 3.15, 1.4, 2.65, 2.85, 1.3 (11.35); III 2.9, 1.25, 2.45, 3.45, 1.4 (11.45); IV 3.75, 1.4, 3.25, 5.15, 1.95 (15.5).

Epigyne and internal genitalia as in Figs 60–62 View FIGURES 54–62 . Fovea slightly longer than wide. Septal base smooth, 2 times longer than wide. Septal stem undeveloped. Lips of the epigyne ( Li) not touching each other. Apical pocket with one hood. Receptacles fusiform. Copulatory ducts ( Cd) almost straight, as long as receptacles.

Distribution. Known only from the type locality in the Altai Mountains ( Figs 75–76 View FIGURES 72–77 ).