A review of the Holarctic genus Tmeticus Menge, 1868 (Araneae, Linyphiidae), with a description of a new genus Author Marusik, Yuri M. Author Koponen, Seppo text ZooKeys 2010 59 15 37 http://dx.doi.org/10.3897/zookeys.59.508 journal article http://dx.doi.org/10.3897/zookeys.59.508 1313-2970-59-15 Tmeticus nigriceps ( Kulczynski , 1916) Figs 1823 -2435- 445255 Gongylidium nigriceps Kulczynski 1916: 8 , pl. 1, f. 10 (♀). Tmeticus nigriceps : Holm 1973: 89 . Tmeticus nigriceps : Eskov 1994: 107 . Misidentifications. (all refer to Zornella cultrigera (L. Koch, 1879) see Holm (1973) : Gongylidium nigriceps : Tullgren 1955: 355 , f. 56 (♀). Gongylidium nigriceps : Hauge 1969: 6 , f. 12 (♀). Material examined. RUSSIA: Arkhangel'sk Area: 1♂ (IBPN), Barents Sea, Dolgiy Ilsand, 69°12'N, Summer 2004 (O.L. Makarova). Polar Ural: 1♂ (ZMUT), Oktyabrskij, Ob River shore, Salix viminalis vegetation, 12.-13.7.1994 (S. Koponen); 1♀ (PSU-95), North Ural expedition by Fridolin, sample 36, Sob' River right bank, 4.07.1925 (V. Fridolin). Yamal Peninsula: 1♂ 5♀ (ZMMU), Yorkugayakha River, environs of "Canary" trading station, riparian willow stand, 08.07.2002 (D. Osipov); 4♂ 1♀ (ZMMU), south Yamal, Shchuchye Vill, Shchuchya River (A.L. Tikhomirova); 1♂ (PSU-96), South Yamal, Khadyta-Yakha River, meadow valley, pitfall traps, 8.08.1982 (S.L. Esyunin); 1♂ 1♀ (PSU-97), same locality, river bank, drift, 26.07.1981 (S.L. Esyunin). Taimyr Peninsula: 1♂ 1♀ (ZMMU), Taimyr Reserve, Novaya River, Ary-Mas Site, 25.07.1992 (A.B. Ryvkin); 10♂ 1♀ (ZMMU), SW Taimyr, Nyapan' Ridge, 70°09N; 87°47E, Carex-moss bog, pitfall trapping, 1-10.08.1999 (D. Osipov); 3♂ (ZMMU), NW shore of Pyasino Lake, 70°04'54N; 87°32'12E, Carex bog with sphagnum tussocks, 10-20.07.1999 (D. Osipov); 3♂ 2♀ NW shore of Pyasino Lake, 70°04'54N; 87°32'17E, Carex bog with sphagnum tussocks, Summer 1999 (D. Osipov); 2♀ (ZMMU), NW shore of Pyasino Lake, Lazannakh Lake, sandy beach, 70°05'47N; 87°26'28E, 1-10.07.1999 (D. Osipov). Yakutia: 2♀ (IBPN), Yana River down flow, environs of Kular Village, 70°35N; 134°34E, grass-herb- Arctagrostis meadow on the former open mine, Summer, 2000 (N.K.Potapova). Chukotka: 2♂ (IBPN), western Chukotka, Chaun River mouth part, 68.810°N; 170.432°E, Summer , 1986 (A.S. Ryabukhin); 1♂ (IBPN), western Chukotka, Chaun Bay, Pucheveyem River mouth, 25.07.1985 (A.S. Ryabukhin); 1♂ (IBPN) Lamutskoye Vil., 65°32'39N; 168°51'08E, along creek, 17.08.1968 (Novikova); 1♂ (IBPN), western Chukotka, Markovo Town, July 1986 (G. Chernova); 1♂ (IBPN), Vulvyveyem River upper flow, Gytlenumkuum Stand, 67°10N; 178°E, 8.06.1988 (Yu.M. Marusik). Figures 35-39. Copulatory organs and male carapace of Tmeticus nigriceps . 35 male palp, retrolateral view 36 palpal tibia, dorso-lateral view 37 whole male palp, retrolateral view 38 male carapace, dorsal view 39 epigyne, ventral view. (scale bar 0.1 mm). Figures 40-44. Copulatory organs of Tmeticus nigriceps . 40 male palp, retrolateral view 41 male palp, prolateral view 42 male palp, dorso-prolateral view 43 epigyne, ventral view 44 epigyne, caudal view. Abbreviations: Ap - anterior radial process; Em - embolus proper; Me - embolic membrane;Ts - tegular sac. Figures 45-48. Copulatory organs of Tmeticus ornatus . 45 male palp, retrolateral view 46 male palpal patella and tibia, retrolateral view 47 epigyne, caudal view 48 epigyne, ventral view. Abbreviations: Tt - patellar tooth. Figures 49-53. Retrolateral view of the male palp of Tmeticus affinis (49), Tmeticus tolli (50), Tmeticus ornatus (51), Tmeticus nigriceps (52) and Paratmeticus bipunctis (53). (scale bar 0.1 mm). Diagnosis. Tmeticus nigriceps is easily distinguished from the other Palaearctic species by the dark cephalic region contrasting with the reddish thoracic area. Only the Nearctic Tmeticus ornatus has a similar colour pattern. The male palp is almost undistinguishable from the Siberian Tmeticus tolli and the Nearctic Tmeticus ornatus . In addition to the carapace pattern, females can be distinguished by the shape of their epigyne. Description. ♀ 2.9-3.3, ♂ 2.3-2.7. TmI 0.69-0.72. Carapace orange with dark, blackish cephalic region (Figs 23-24, 38) and chelicera. Legs orange. Abdomen black. Palp as in Figs 35-37, 40-42, 52, epigyne as in Figs 18, 39, 43-44. Comments. Holm (1973) re-examined the specimens from Sweden identified and recorded as Gongylidiun nigriceps by Tullgren (1955) and concluded that they were misidentifications of Zornella cultrigera (L. Koch, 1879). The figure of the female epigyne from Norway in Hauge (1969) identified as Gongylidium nigriceps also refers to Zornella cultrigera . Distribution . This species is known from Dolgiy Island and the Polar Urals to Chukotka ( Eskov 1994 ). It is restricted to the tundra zone. Figures 54-61. Embolic division of Tmeticus ornatus (54), Tmeticus nigriceps (55), Tmeticus tolli (56), Oreoneta sp. (57), Lophomma punctatum (58), Paratmeticus bipunctis (59-60) and Tmeticus affinis (61). Abbreviations: Ap - anterior radial process; Em - embolus proper; Ma - mastidion; Me - embolic membrane;Pt - protegulum; Sa - distal suprategular apophysis;Tp - tailpiece;Ts - tegular sac. Figures 62-65. Copulatory organs of Paratmeticus bipunctis . 62 male palp, retrolateral view 63 male palpal tibia, dorso-retrolateral view 64 whole male palp 65 epigyne, ventral view. Figures 66-73. Copulatory organs and male chelicera of Paratmeticus bipunctis . 66 male palp, retrolateral view 67 male palp, ventral view 68 male chelicera inner view 69 male palp, from above 70 male palp, prolateral view 71 male palp, dorsal view 72-73 epigyne, ventral and caudal view. Arrows show the cheliceral teeth. Abbreviations: Ap - anterior radial process; Em - embolus proper; Ma - mastidion; Me - embolic membrane;Sa - distal suprategular apophysis;Tp - tailpiece;Ts - tegular sac.