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Arthropoda Selecta 19(3): 199202

ї ARTHROPODA SELECTA, 2010

A new species of Tetragnatha Latreille, 1804 (Aranei: Tetragnathidae) from western Kazakhstan Новый вид Tetragnatha Latreille, 1804 (Aranei: Tetragnathidae) из западного Казахстана Yuri M. Marusik Ю.М. Марусик
Institute for Biological Problems of the North, RAS, Portovaya Str. 18, Magadan 685000, Russia. E-mail yurmar@mail.ru Институт биологических проблем Севера, ДВО РАН, Портовая 18, 685000 Магадан Россия. Zoological Museum, University of Turku, FI-20014 Turku Finland.

KEY WORDS: new species, Aral Sea, Barsakelmes, spider. КЛЮЧЕВЫЕ СЛОВА: новый вид, Аральское море, Барсакельмес, паук.

ABSTRACT. The new species Tetragnatha kovblyuki sp.n. is described, based on two males collected from Barsakelmes Island, Aral Sea, Western Kazakhstan. The palp and chelicera of the new species are compared with those of T. pinicola L. Koch, 1870. РЕЗЮМЕ. По двум самцам собранным на острове Барсакельмес в Аральском море описан новый вид Tetragnatha kovblyuki sp.n. Пальпа и хелицера самца нового вида сравниваются с таковыми у T. pinicola L. Koch, 1870.

Material and methods
Specimens were photographed using an Olympus Camedia E-520 camera attached to an Olympus SZX16 stereomicroscope. The images were montaged using CombineZP image stacking software. Photographs were taken in dishes of different sizes with paraffin in the bottom. Different sized holes were made in the paraffin to keep the specimens in the correct position. All measurements are given in mm. Type material will be deposited in the Moscow State University (ZMMU).

Introduction
Tetragnatha Latreille, 1804 is one of the largest spider genera, with 344 species [Platnick, 2010]. It is also one of the few spider genera distributed worldwide, and perhaps the only genus occurring from the tundra zone in the Holarctic to Chile, Argentina and Tasmania. The genus is well studied in the Holarctic, South East Asia, Australia and South Africa, but relatively little is known about the South American fauna. Many Tetragnatha species have wide ranges and most live near water and make orb webs on grass. Seventeen species of Tetragnatha are known from the former Soviet Union [Mikhailov, 1997]. Half of them are known exclusively from the south of the Russian Far East. Six species of Tetragnatha have been reported from Kazakhstan [Mikhailov, 1997]. All of them are widespread species. A few years ago I got specimens from Barsakelmes Island in the Aral Sea, collected in the early 1980s, a time when the Aral Sea had much more water (Fig. 14) and the island was really isolated. Detailed study reveals that two male specimens from Barsakelmes Island belong to an undescribed species, the description of which is given below.

Species description
Tetragnatha kovblyuki sp.n. Figs 16, 911, 14.
Tetragnatha sp.: Pavlenko, 1995: 153. MATERIAL: Holotype and paratype (ZMMU), KAZAKHSTAN, Aral Sea, Barsakelmes Island, bugut (=artificial hollow for collecting water) near Barsakelmes Reserve Campus, 23.05.1982 (D.D. Piryulin). Holotype male with detached left palp and detached and lost left chelicera. Paratype male with both palps detached, one of which is lost.

ETYMOLOGY. The specific name is a patronym in honour of my friend and colleague Mykola M. Kovblyuk (Simferopol, Ukraine). DIAGNOSIS. By the shape of the male palp the new species resembles T. pinicola L. Koch, 1870, a trans-Palaearctic species. The new species can be distinguished by its straight conductor (bent tip in T. pinicola, Figs 78). The two species have clear differences in colouration of sternum: light brown without a pattern in the new species and dark brown with yellow stripe in T. pinicola. T pinicola differs from the new species by the shape of Schragzahn tooth (sensu Wiehle [1963]) (cf. Figs 10 and 13) and also by smaller size (4.55 mm).


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Figs 16. Male palp and eye field of Tetragnatha kovblyuki sp.n. (16) and T. pinicola (78): 1, 8 palp, ventral; 2 palp, dorsal (terminal part of cymbium removed); 34, 7 palp, subterminal view; 6 eye field, dorsal. Рис. 16. Пальпа самца и глазное поле Tetragnatha kovblyuki sp.n. (16) и T. pinicola (78): 1, 8 пальпа, снизу; 2 пальпа, сверху (верхняя часть цимбиума удалена); 34, 7 пальпа, вид спереди; 6 глазное поле, сверху.


A new species of Tetragnatha from western Kazakhstan

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Figs 913. Somatic characters of Tetragnatha kovblyuki sp.n. (911) and T. pinicola (1213): 9 mouth parts, ventral; 11 body, dorsal; 12 anterior part of cephalothorax, dorsal; 12, 13 chelicera, posterior and anterior. Arrow shows differences in tooth. Рис. 913. Соматические признаки Tetragnatha kovblyuki sp.n. (911) и T. pinicola (1213): 9 ротовой аппарат, снизу; 11 габитус, сверху; 12 передняя часть головогруди сверху; 12, 13 хелицера, сзади и спереди. Стрелка показывает различия.

Fig. 14. Maps showing type locality and size of the Aral Sea in 70th (left) and now (right). Рис. 14. Карты показывают типовое местообитание и размер Аральского моря в 1970-е гг. (слева) и сейчас (справа).


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the final draft was kindly checked by D.J. Buckle. This work was supported in part by the RFFI grant # 09-04-01365.

DESCRIPTION. Total length 5.356.0. Carapace 2.02.35 long, 1.231.4 wide; yellow without pattern. Lateral eyes widely spaced (Figs 6, 1011). Sternum uniformly colored. Abdomen subcylindrical, without dorsal abdominal pattern. Legs very long. Leg I in holotype (carapace 2.0 long) 4.3 + 0.85 + 2.5 + 4.65 + 1.5. Leg I in paratype (carapace 2.35 long) 6.25 + 1.1 + 6.5 + 7.25 + (missing). Carapace length/femur I ratio 2.152.66. Chelicera 1.85 long (in paratype). Fang without dorsal tooth. Palp as in Figs. 15, conductor straight in ventral view, blunt and tip not bent. DISTRIBUTION. Type locality only.
ACKNOWLEDGEMENTS. I thank Seppo Koponen who arranged my stay in Turku and allowed the use of local facilities (digital camera attached to microscope). English of

References
Mikhailov K.G. 1997. Catalogue of the spiders of the territories of the former Soviet Union (Arachnida, Aranei) // Sbornik trudov Zoologicheskogo Muzeya MGU. Moscow: Zoological Museum, Moscow State University. Vol.37. 416 pp. Pavlenko T.V. 1985. [Distribution of spiders in the natural complexes of the Barsakelmes Island (Aral Sea)] // Fauna i ekologia paukov. Trudy Zoologicheskogo Instituta AN SSSR. T.139. P.147155 [in Russian]. Platnick N.I. 2010. The World Spider Catalog, Version 10.5. American Museum of Natural History, online at: http://research.amnh. org/iz/spiders/catalog/ (accessed May31, 2010). Wiehle H. 1963. Spinnentiere oder Arachnoidea (Araneae). XII. Tetragnathidae Streckspinnen und Dickkiefer // Tierwelt Deutschlands. Lfg.49. S.176.