A review of the spider genus Porrhomma (Araneae, Linyphiidae) Author Růžička, Vlastimil text Zootaxa 2018 2018-09-14 4481 1 1 75 journal article 29177 10.11646/zootaxa.4481.1.1 ac892ad5-037a-4486-9fdb-3082b98cbf49 1175-5326 1454736 BFC4982D-BB84-4141-BDFD-203F23CD1585 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. FIGURE 27. A–F, Porrhomma magnum from West Sayan Mts., Russia. A, ♀ carapace, frontal view. B, embolic section. C, epigynum. D–F, vulva, ventral, caudal and dorsal. Abbreviations: A, appendix; AP, anterior process of the embolic plate; MS, main sack; V, velum. Scale bars, 0.1 mm. FIGURE 28. Global distribution of Porrhomma magnum . 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 .