Porrhomma Simon 1884

• Main Author: Růžička, Vlastimil
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2018
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Arachnida; Araneae; Linyphiidae; Porrhomma; Tundra; Siberia
• Online Access: https://doi.org/10.5281/zenodo.5963985; http://treatment.plazi.org/id/03C6A93BFFF6FFF7FF7CF99386953CDE

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. Published as part of Růžička, Vlastimil, 2018, A review of the spider genus Porrhomma (Araneae, Linyphiidae), pp. 1-75 in Zootaxa 4481 (1) on pages 33-35, DOI:10.11646/zootaxa.4481.1.1, http://zenodo.org/record/1454736