中国肥腹蛛属一新种记述(蜘蛛目:球蛛科)

A New Species of the Genus Steatoda(Araneae:Theridiidae) from China

2008～2010年在宁夏六盘山国家级自然保护区进行无脊椎动物科学考察,采集到蜘蛛目球蛛科Theridi-idae蜘蛛标本3370余头,经鉴定共有13属。发现肥腹蛛属Steatoda一新种,命名为彭阳肥腹蛛Steatoda pengyangensissp.nov.。模式标本保存于河北大学博物馆。

Scientific investigation of invertebrate was taken to Liupanshan National Nature Reserve,Ningxia,during 2008 to 2010.3370 theridiid specimens were collected which belonging to 13 genera.After examining and identifying all the specimens,one new Steatoda species was recognized：Steatoda pengyangensis sp.nov.The type specimens are deposited in the Museum of Hebei University（MHBU）.All measurements given here are in mm.Steatoda pengyangensis sp.nov.（Figs.a^m） Material：Holotype ♂,Guamagou Forest Farm,Pengyang County（35°23 N,106°16＇ E）,Ningxia Hui Autonomous Region,11 July 2008,collected by Zhang Chao.Paratypes：3♀,same data as holotype;1♂4♀,same location,26 July 2010,collected by Hu Dong-sheng and Peng Yan-qiu.Etymology：The specific name refers to the type locality.Diagnosis：Among the congeners,this new species is very similar to Steatoda hui Zhu,1998 in the shape of the genital organs,but it can be distinguished from the latter by：（1） embolus relatively thin,while embolus thicker in the latter（Figs.g,l）;（2） membranous conductor longer than that of in the latter（Figs.f,k）;（3） epigynum have an almost rectangular atrium posteriorly,and a larger depression anteriorly,which copulatory openings lying in the depression（Figs.d,i）;while epigynal atrium is triangular in S.hui.Description：Males total length 5.47~5.58.Holotype total length 5.58：cephalothorax 2.47 long,1.84 wide;abdomen 2.95 long,1.74 wide.AER recurved and PER almost straight from dorsal view.Eyes are with black rings.Eyes measurements：AME 0.10,ALE 0.10,PME 0.13,PLE 0.13;AME-AME 0.10,AME-ALE 0.10,PME-PME 0.10,PME-PLE 0.13,ALE and PLE contiguous.MOA wider than long（0.33：0.30）,front width as long as back width（0.33：0.33）.Clypeus height 0.40,four times as high as diameter of AME.Chelicerae with one promarginal tooth and no retromarginal tooth.Leg measurements：Ⅰ 10.89（3.21＋1.05＋2.47＋2.84＋1.32）,Ⅱ 8.57（2.58＋0.84＋1.89＋2.26＋1.00）,Ⅲ 6.52（2.10＋0.68＋1.37＋1.58＋0.79）,Ⅳ 9.00（2.74＋0.84＋1.95＋2.42＋1.05）.Leg formula：1423.Females total length 5.31~5.73.A paratype female total length 5.73：cephalothorax 1.95 long,1.89 wide;abdomen 3.95 long,3.26 wide.Eyes measurements：AME 0.10,ALE 0.10,PME 0.15,PLE 0.15;AME-AME 0.08,AME-ALE 0.05,PME-PME 0.10,PME-PLE 0.10.MOA wider than long（0.35：0.28）,front width as long as back width（0.35：0.35）.Leg measurements：Ⅰ 10.26（3.00＋0.89＋2.37＋2.74＋1.26）,Ⅱ 7.79（2.37＋0.84＋1.63＋1.95＋1.00）,Ⅲ 6.10（1.84＋0.68＋1.16＋1.58＋0.84）,Ⅳ 8.74（2.74＋0.95＋ 1.74＋2.21 ＋1.10）.Leg formula：4123.