Mongolicosa cherepanovi Fomichev & Marusik 2018, sp. n.

Mongolicosa cherepanovi sp. n.

Figs 8g ‒i, 9e‒f, 10

Types. Holotype ♀ (ZMMU) MONGOLIA, Bayan-Ölgii Aimag, Cengel-Khairkhan-Nuruu Mt. Range, Cengel- Khairkhan Mt. (48°38'36"N, 89°10'22"E), moraine, 3300‒3400 m, 15.07.2017 (A.A. Fomichev). Paratypes: 2♀ (ZMMU) same locality (48°39'N, 89°10'E), mountain stony tundra, 3620-3770 m, 15.07.2017 (A.A. Fomichev).

Etymology. The specific name is a patronym in honor of Mr Alexander Cherepanov, a friend of the senior author and a driver in several expeditions to Mongolia, and who brought the 2017 expedition to the type locality of this species.

Diagnosis. Mongolicosa cherepanovi sp. n. is most similar to M. glupovi Marusik, Azarkina & Koponen, 2004 in the shape of the epigyne septum. The new species differs from M. glupovi in having the pear-shaped fovea, the longer anterior part of the fovea and strongly converging receptacles vs. the almost round fovea, with a very short anterior part (as long as the anterior pocket width) and almost parallel receptacles (cf. Fig. 8g ‒i and figs 208‒212 in Marusik et al. 2004).

Description. Female (holotype). Total length 6.9. Carapace 3.5 long, 2.85 wide. Coloration: carapace and sternum black. Labium, endites, chelicerae and palps dark brown. Legs dark brown with almost black Fe. Leg IV darker than others. Abdomen black. 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; Mt p0- 1-0 r0-1-0 v2-2.

Epigyne as in Fig. 8g ‒i. Fovea pear-shaped, its anterior part as long as the posterior one, the posterior arms of plate touching each other. Septum abruptly widened in the posterior part of fovea, forming a diamond-shaped base. Receptacles (Re) well distinguishable from the copulatory ducts (Cd), converging, head of receptacles spaced by one diameter in the intact epigyne (Fig. 8g).

Male. Unknown.

Size variation. Females vary from 6.6 to 6.9 in body length, carapace 3.3‒3.5 long, 2.7‒2.85 wide (n=3).

Habitat. The new species inhabits the humid and very cold mountain stony tundra and moraines at elevations of 3300‒3770 m (Fig. 9e‒f).

Distribution. Known from the type locality only. Cengel-Khairkhan-Nuruu Mt. Range is one of the highest mountain ranges of the Mongolian Altai (Fig. 10).