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16 1 023 028 Tanasevitch, Piterkina.PM6 Arthropoda Selecta 16 (1): 2328 © ARTHROPODA SELECTA, 2007 Four new species of the spider family Linyphiidae (Aranei) from clay semidesert of Western Kazakhstan ×åòûðå íîâûõ âèäà ïàóêîâ ñåì. Linyphiidae (Aranei) èç ãëèíèñòîé ïîëóïóñòûíè Çàïàäíîãî Êàçàõñòàíà Andrei V. Tanasevitch* & Tatyana V. Piterkina ** À.Â. Òàíàñåâè÷* è Ò.Â. Ïèòåðêèíà** * Centre for Forest Ecology and Production, Russian Academy of Sciences, Profsoyuznaya Str., 84/32, Moscow 117997, Russia. E-mail: [email protected] * Öåíòð ïî ïðîáëåìàì ýêîëîãèè è ïðîäóêòèâíîñòè ëåñîâ ÐÀÍ, Ïðîôñîþçíàÿ óë. 84/32, Ìîñêâà 117997, Ðîññèÿ. **Institute of Ecology and Evolution, Russian Academy of Sciences, Leninsky Prospect, 33, Moscow 119071, Russia. E-mail: [email protected] ** Èíñòèòóò ïðîáëåì ýêîëîãèè è ýâîëþöèè ÐÀÍ, Ëåíèíñêèé ïðîñïåêò, 33, Ìîñêâà 119071, Ðîññèÿ. KEY WORDS: Spiders, Linyphiidae, new species, Kazakhstan, desert steppe. ÊËÞ×ÅÂÛÅ ÑËÎÂÀ: Ïàóêè, Linyphiidae, íîâûå âèäû, Êàçàõñòàí, îïóñòûíåííûå ñòåïè. ABSTRACT. Four species of the family Linyphi- Material and methods idae, i.e., Improphantes contus sp.n., Silometopus cras- sipedis sp.n., Trichoncus villius sp.n., and Walckenaeria The material was collected from April to October stepposa sp.n. are described from clay semidesert of in 2004 and 2005 on the territory of the Dzhanybek Western Kazakhstan (environs of Dzhanybek). Research Station (DRS) of the Institute of Forestry, Russian Academy of Sciences, in the environs of Dzh- ÐÅÇÞÌÅ. Èç ãëèíèñòîé ïîëóïóñòûíè Çàïàäíî- anybek village (49o23' N, 46o47,5' E). DRS is situated ãî Êàçàõñòàíà (îêð. ïîñ. Äæàíûáåê) îïèñàíû 4 âèäà in the westernmost point of Kazakhstan, just near the ïàóêîâ ñåì. Linyphiidae: Improphantes contus sp.n., border with Volgograd Province of Russia. The area Silometopus crassipedis sp.n., Trichoncus villius sp.n. studied is a flat plain in the northwest Caspian Sea è Walckenaeria stepposa sp.n. Lowland referred to semidesert zone [Milkov & Gvoz- detsky, 1986]. Vegetation cover is characterized by the Introduction complexity and composed by mosaic of desert and steppe plant communities. Microelevations are desert The Russian Plain may be characterized as a well biotopes with Kochia prostrata and Artemisia pauci- taxonomically studied region, so it would seem new flora associations on solonetz soils. Microdepressions linyphiid species are hardly expected. However, steppe (up to 0.4 m depth) are steppe biotopes with forb-grass regions quite often give us surprises. Seven new taxa of vegetation (Stipa spp., Festuca valesiaca, Agropyron linyphiids have been described from steppe/desert re- cristatum, etc.) on dark chestnut and meadow chestnut gions of the Russian Plain during recent years [Ta- soils. Microslopes are occupied by typical semidesert nasevitch, 1987, 1993, 2000, 2004], and, as we see, vegetation (Agropyron desertorum, Tanacetum achil- thats not a limit. leifolium, Galatella villosa etc.) on light chestnut soils. There is very little information about linyphiid spi- In the descriptions, chaetotaxy in Micronetinae as ders from Western Kazakhstan. The only paper [Ta- follows: Ti I: 2-1-1-2(1), which means that tibia I has nasevitch, 1987] contains a checklist of seven species two dorsal, one pro- and one retrolateral spine, and two and a description of a new genus. The revision of that or one ventral spine (the apical spines are herewith material deposed in ZMMU showed the specimens disregarded); in Erigoninae is given by the following determined as Agyneta rurestris (C.L. Koch, 1836) formula: 2.2.1.1, which refers to the number of dorsal were actually a mixture of two species, i.e., A. rurestris spines on tibiae IIV, respectively; The sequence of and A. saaristoi Tanasevitch, 2000. leg segments in measurement data is as follows: femur The recent investigation on spiders from the envi- + patella + tibia + metatarsus + tarsus. All measure- rons of Dzhanybek gave us some new species, the ments are given in mm. Scale lines in figures = 0.1 mm, description of four of which is the subject of this paper. unless otherwise indicated. 24 A.V. Tanasevitch & T.V. Piterkina Figs 18. Improphantes contus sp.n.: 1 right palp, 2 paracymbium (ventro-lateral view), 3 embolic division, 4 lamella characteristica, 5 embolus, 68 epigyne (ventral, lateral & dorsal view, respectively). Ðèñ. 18. Improphantes contus sp.n.: 1 ïðàâàÿ ïàëüïà, 2 ïàðàöèìáèóì (âèä ñáîêó è ñíèçó), 3 ýìáîëþñíûé îòäåë, 4 lamella characteristica, 5 ýìáîëþñ, 68 ýïèãèíà (âèä ñíèçó, ñáîêó è ñâåðõó, ñîîòâåòñòâåííî). The following abbreviations are used in the text and position of the metatarsal trichobothrium, ZMMU figures: ARP anterior radical process, BC bursa Zoological Museum of the Moscow State University. copulatrix, DRS Dzhanybek Research Station, EG Illustrations were made using a binocular with a entrance groove, EP embolus proper, Fe femur, drawing device. L lamella characteristica, LL lateral lobes, MM median membrane, Mt metatarsus, PMP posterior Improphantes contus sp.n. median plate, PO posterodorsal outgrowth, Ps Figs 18. proscape, SA suprategular apophysis, St stretcher, MATERIAL. Holotype # (ZMMU: Ta-6800), Western Kaza- TA terminal apophysis, Ti tibia; TmI the khstan, env. of Dzhanybek, DRS, clay semidesert, steppe associa- For new linyphiid species from clay semidesert of Western Kazakhstan 25 Figs 913. Silometopus crassipedis sp.n.: 9, 10 left palp (retrolateral & prolateral view, respectively), 11 palpal tibia (dorsal view), 12, 13 epigyne (ventral & dorsal retrolateral view, respectively). Ðèñ. 913. Silometopus crassipedis sp.n.: 9, 10 ëåâàÿ ïàëüïà (âèä ñáîêó è ñçàäè, ñîîòâåòñòâåííî), 11 ãîëåíü ïàëüïû (âèä ñâåðõó), 12, 13 ýïèãèíà (âèä ñíèçó è ñâåðõó, ñîîòâåòñòâåííî). tion with diverse herbs, in pitfall traps, 1521.IV.2004, leg. T.V. TAXONOMICAL REMARKS. According to the shape Piterkina. of the embolus and the epigyne conformation, this species Paratypes: 6 $$ (ZMMU: Ta-6801), same locality, 15.IV clearly belongs to Improphantes Saaristo et Tanasevitch, 20.V.2004, leg. T.V. Piterkina. 1996, recently established for the improbulus-species group DESCRIPTION. Male. Total length, 2.50. Carapace 1.15 of Lepthyphantes sensu lato [Saaristo & Tanasevitch, 1996]. long, 0.98 wide, pale brown with black narrow margin. The epigyne of I. contus sp.n. is somewhat similar to I. Chelicerae 0.50 long. Legs yellow. FeI, 1.45 long, other geniculatus (Kulczyñski, 1898), but differs by the absence joints lost. Leg IV, 5.29 long (1.43+0.30+1.38+1.38+0.80). of the projected lateral walls and narrowing distally pros- Chaetotaxy: see female. Palp (Figs 15): Cymbium with a cape. Male, besides boat-hook-shaped distal part of the lamel- small posterodorsal outgrowth. Paracymbium U-shaped, distal la characteristica, well differs from other congener by the lobe at base with four sharp teeth different in size. Lamella number and arrangement of teeth in the paracymbium. characteristica boat-hook-shaped distally. Embolus semilu- ECOLOGY. Mature specimens occur in AprilMay in nar, embolus proper as a sharp tooth. Abdomen 1.40 long, steppe plant associations. All samples were collected by 0.80 wide, grey, dorsal pattern absent. pitfall trapping. Female. Total length, 2.85. Carapace 0.98 long, 0.85 DISTRIBUTION. Known from the type locality only. wide. Chelicerae 0.50 long. Legs yellow. Femur I, 1.30 long, other joints lost. Leg IV, 4.75 long (1.25 + 0.30 + 1.20 + 1.25 + 0.75). Chaetotaxy: Fe I: 0-1-0-0, IIIV: 0-0-0-0; TiI: 2- Silometopus crassipedis sp.n. 1(2)-1(2)-0(1), IIIII: 2-0-1-0, IV: 2-0-0(1)-0; MtI-IV: 1-0- Figs 913. 0-0. TmI, 0.22. Abdomen 2.00 long, 1.50 wide. Epigyne (Figs 68): Proscape egg-shaped, conical in dorsal view. MATERIAL. Holotype # (ZMMU: Ta-6802), Western Kaza- khstan, env. of Dzhanybek, DRS, clay semidesert, desert associa- Median part of scape narrow, without expansion. Distal part tion with Kochia prostrata and Arthemisia pauciflora, in pitfall of scape well-developed, lateral lobes wide. PMP wide and traps, 1421.IV.2004, leg. T.V. Piterkina. narrow, with a not deep notch. Body and leg colouration as Paratypes: 1 #, 21 $$ (ZMMU: Ta-6803), same locality, 14.IV in male. 20.V. 2004 & 6.X.2004, leg. T.V. Piterkina. ETYMOLOGY. The specific name in Latin means boat- DESCRIPTION. Male. Total length, 1.53. Carapace un- hook, which refers to the shape of the lamella characteristica. modified (only head slightly elevated), 0.63 long, 0.58 wide, DIAGNOSIS. This species can be easily distinguished brown, with dark median spot and dark margin. Clypeus not from the other congeners by boat-hook-shaped distal part of protruded. Legs pale brown. Leg I, 1.89 long (0.55 + 0.23 + the lamella characteristica in male, and by the egg-shaped 0.45 + 0.38 + 0.28), leg IV, 2.02 long (0.58 + 0.20 + 0.53 + proscape, conical in dorsal view in female. 0.43 + 0.28). Chaetotaxy: spines on TiIIII reduced (?), 26 A.V. Tanasevitch & T.V. Piterkina Figs 1421. Trichoncus villius sp.n.: 14, 15 male carapace (lateral & dorsal view, respectively), 16 left palp, 17 palpal tibia & cymbium (retrolateral view), 18 palpal tibia & basal part cymbium (dorsal view), 19 embolic division & suprategular apophysis, 20 suprategular apophysis, 21 epigyne (ventral view). Ðèñ. 1421. Trichoncus villius sp.n.: 14, 15 êàðàïàêñ ñàìöà (âèä ñáîêó è ñâåðõó, ñîîòâåòñòâåííî), 16 ëåâàÿ ïàëüïà, 17 ãîëåíü ïàëüïû è öèìáèóì (âèä ñçàäè), 18 ãîëåíü ïàëüïû è áàçàëüíàÿ ÷àñòü öèìáèóìà (âèä ñâåðõó), 19 ýìáîëþñíûé îòäåë è ñóïðàòåãóëÿðíàÿ àïîôèçà, 20 ñóïðàòåãóëÿðíàÿ àïîôèçà, 21 ýïèãèíà (âèä ñíèçó). TiIV with a short dorsal spine in position 0.38. Femora IIIIV. TmI, 0.67. Abdomen 1.15 long, 0.80 wide. Epigyne and tibiae III in 1.52 times wider than of IIIIV. All (Figs 12, 13): Anterior part of epigyne with a deep notch, metatarsi with a trichobothrium. TmI, 0.69. Palp (Figs 9 receptacles spherical. Body and leg colouration as in male. 11): Tibia unmodified, retrolaterally with a small tooth. ETYMOLOGY. The specific name in Latin means thick- Anterior radical process (sensu Hormiga [2000]) of embol- legged, masculine.
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