Survey Study On Spider From Xilin Gol Grassland In Inner Mongolia

The Xilin Gol League is located in the eastern part of Inner Mongolia Autonomous Region.It is the third largest league (202600km2), making up about17.13%of Inner Mongolia.With its unique landform,climate and varied flora and spider fauna it is regarded as one of the most important areas in the study of spider in China. The paper studied the Classification of spiders from Xilin Gol grassland.218species belonging to86genus and22families from Xilin Gol League. Of which,4new record genera of Inner Mongolia (Robertus O.P.-Cambridge.1879,Theridula Emerton,1882, Allomengea Strand,1912and Tapinopa Westring,1851),1new species is described:Dipoena wulagaiensis sp.nov.,1new discovery of the female:Araneus yadongensis (Hu,2001) and3are newly recorded from China:Alopecosa sokhondoensis (Logunov&Marusik,1995), Dictyna ubsunurica (Marusik&Koponen,1998), Dipoena melanogaster (C. L. Koch,1837),2female new recovery in China:Yllenus flavociliatus (Simon,1895),Sitticusfloricola(C.L.Koch,1937). The faunistic analysis of spiders from Xilin Gol grassland displayed that the144species were Only distributed in the Palaearctic, accounting for66.36%, there were46common species between Palaearctic and Oriental, accounting for21.20%. In Xilin Gol League the most of spiders distribute is in Mongolia-Xin jiang regions, Northern-China and Northern-east.34species were Only distributed in the Mongolia-Xin jiang regions, accounting for15.67%, there were31common species between Mongolia-Xin jiang regions and Northern-east,accounting for14.29%,16common species between Mongolia-Xin jiang regions and Northern-China, accounting for7.37%,30common species in Mongolia-Xin jiang regions, Northern-east, Northern-China, accounting for13.82%. The species in six Vegetation zones of Xilin Gol League is as follow:there are138species (63.59 %of all) belonging to52genus and15families from sandy area,87species (40.09%of all) belonging to46genus and16families from dry steppe,80species (36.87%of all) belonging to37genus and13families from mountain meadow steppe,76species (35.02%of all) belonging to33genus and12families from plain meadow steppe,38species (17.51%of all) belonging to22genus and12families from pastoral ecotone,33species (15.21%of all) belonging to19genus and9families from desert steppe.