Porrhomma boreale

• Main Author: Růžička, Vlastimil
• Format: Other/Unknown Material
• Language: unknown
• Published: 2018
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Arachnida; Araneae; Linyphiidae; Porrhomma; Porrhomma boreale; Taymyr; Norilsk; Kolyma; Magadan; Arman’; Tyellakh; Egvekinot; Chukotka; Chukotka Autonomous Okrug; Evenk; kolyma river; norilsk; Sakhalin; Taymyr Peninsula; Tundra; Siberia
• Online Access: https://zenodo.org/record/5963967; https://doi.org/10.5281/zenodo.5963967

Porrhomma boreale (Banks, 1899) Figs. 9A–F. Gongylidium borealis Banks, 1899 — Banks (1899): p. 347, Pl. A, Fig. 1 (descr. ♂ ♀); transferred by Eskov (1988). Oedothorax borealis — Strand (1906): p. 445. Porrhomma nunamo Holm, 1970 — Holm (1970): p. 194, Figs. 12–15 (descr. ♂ ♀); synonymised by Eskov (1988). P. kulczynskii Staręga, 1974 — Staręga (1974): p. 22, Figs. 7–8, Phot. 3 (descr. ♀); synonymised by Tanasevitch (2013a). P. borealis — Eskov (1988): p. 105; transfer, synonymy. P. boreale — Tanasevitch (2013a): p. 184, Figs. 105–116 (♂ ♀); synonymy. Material examined. RUSSIA: Sakhalin Isl., East Sakhalin Mt. Range, below Chamginski Pass, 50°41.951'N, 143°16.234'E, 528 m a.s.l., 8 Aug 2001, 1 ♀. Chukotka Autonomous Okrug, Christ Bay, env. of Egvekinot Town, 15–17 Jul 1988, 2 ♀. NE Siberia, Magadan Area, env. of Magadan, 1st Arman Pass, 59°39.5'N, 150°30.9'E, 700 m a.s.l., 30 Jun 2004, 1 ♀, leg. Yu. M. Marusik. Chita Area, Sokhondo Nature Reserve, mountain tundra, 16 Jul?, 1 Ƌ 2 ♀, leg. S. Danilov. Upper reaches of Kolyma River, Sibit-Tyellakh env., 20 Aug 1984, 3 Ƌ 1 ♀, leg. K. Yu. Eskov (CYM). Central Siberia, Evenk Autonomous Region, delta of Neptene River, 15 Jul 1982, 16 Ƌ 31 ♀, leg. K. Yu. Eskov. Norilsk City, 29 Aug 1983, 1 Ƌ. Diagnosis. The AP has the form of a bird head (e.g. Fig. 9B) in three large species (CW> 0.70): P. boreale, P. convexum and P. nekolai. P. boreale can be distinguished from the later two species by relatively short legs, Mt I/ CW = 0.77–0.81; in P. convexum 0.91–1.06, in P. nekolai 1.31–1.47. Females of P. boreale can be easily recognised from all the other species of the genus Porrhomma by very long main sacks and appendices, which are coiled along main sacks (Figs. 9C–F). Description. ♀ (from Taymyr Peninsula, Russia, 15 Jul 1982). Carapace yellow-brown, 0.80 mm wide, PME– PME = 1.3 (Fig. 9A). Abdomen greyish yellow. Fe I–II with one dorsal spine, Fe I with one prolateral spine. Ti I with one prolateral spine, Ti I–II with one retrolateral spine. Tm Mt I = 0.36, Mt I/CW = ...