Porrhomma, Simon, 1884

Růžička, Vlastimil, 2018, A review of the spider genus Porrhomma (Araneae, Linyphiidae), Zootaxa 4481 (1), pp. 1-75 : 33-35

Porrhomma magnum Tanasevitch, 2012

Figs. 27A–F.

Porrhomma magnum Tanasevitch, 2012 — Tanasevitch (2012): p. 369, Figs. 1–14, 23, 24 (descr. ♂ ♀).

Material examined. Paratypes, 1 Ƌ 3 ♀, RUSSIA: Krasnoyarsk Area, West Sayan Mts., 30–40 km S of Aradan Village, Oyskiy Mt. Ridge , 1700 m a.s.l., 8 Jul 1993, leg. D. Logunov ( ZMMU, Ta-7684).

Diagnosis. Among four species of the magnum -group, P. magnum and P. longjiangense have developed eyes with black rings around. P. magnum can be distinguished from P. longjiangense by very small eyes ( Fig. 27A) and Fe III–IV with one dorsal spine.

Description. ♀ (paratype from West Sayan Mts., Russia, 8 Jul 1993). Carapace yellow-brown, 1.02 mm wide, eyes very small, PME–PME = 2.4 ( Fig. 27A). Abdomen greyish-yellow. Fe I–IV with one dorsal spine, Fe I with two prolateral spines. Ti I with one prolateral spine, Ti I–II with one retrolateral spine. Tm Mt I = 0.39, Mt I/CW = 1.16.

Epigynum with lateral wings ( Fig. 27C). Copulatory ducts are very long, the most complicated in the genus, spermathecae are situated between ascending and descending parts of copulatory ducts ( Figs. 27D–F).

Ƌ (together with female). The AP is shorter than wide, with a concave upper edge, the space between AP and PA very narrow. Embolus very long with a broad velum. Velum without a pigmented spot ( Fig. 27B).

Variation. Ƌ ♀. Carapace 1.00– 1.35 mm wide. Tm Mt I = 0.34–0.39, Mt I/CW = 1.11–1.35 (n = 4).

Ecology. Recorded in mountainous tundra.

Global distribution. Mountains of southern Siberia , Russia and Kazakhstan after Tanasevitch (2012). See Fig. 28.