Taxonomy Of The Genus Pselaphodes(Coleoptera:Staphylinidae:Pselaphinae)from The Oriental Region

Members of the beetle genus Pselaphodes Westwood(Coleoptera: Staphylinidae: Pselaphinae: Tyrini)are medium to large in size,commonly found in forestry leaf litter layer and rotten wood.Species are predats of springtails,mites,and other small invertebrates,playing an important role in food web and ecological chain.Prior to this study,50 species of Pselaphodes have been known worldwide,a majority of them are scattered in the Oriental region.Based on an examination of over 1200 specimens collected from the field,the species of this genus from the Oriental region are treated here,revealing the following results:1.Thirty one new species of Pselaphodes are recognized,of which 30 species are new to science(15 species were published): P.aduncus Huang,Li & Yin,2018(China: Yunnan),P.ampliatus sp.n.(Nepal),P.anjiensis Huang,Li & Yin,2018(China: Zhejiang),P.antennarius Huang,Li & Yin,2018(China: Guizhou),P.bagmatius sp.n.(Nepal),P.baoxingensis Huang,Li & Yin,2018(China: Sichuan),P.bilobatus sp.n.(Nepal),P.corniger sp.n.(Nepal),P.coxatus sp.n.(Nepal),P.daweishanus Huang,Li & Yin,2018(China: Yunnan),P.elongatus Huang,Li & Yin,2018(China: Yunnan),P.femoralis Huang,Li & Yin,2018(China: Zhejiang,Fujian,Guangdong,Guangxi,Sichuan,Guizhou;Thailand),P.incisus Huang,Li & Yin,2018(China: Yunnan;Laos),P.khandbarius sp.n.(Nepal),P.loebli sp.n.(Nepal),P.magnus sp.n.(Nepal),P.maolanensis Huang,Li & Yin,2018(China: Guizhou),P.paraculeus Huang,Li & Yin,2018(China: Guangxi,Guizhou),P.posticus Huang,Li & Yin,2018(China: Jiangxi),P.processus sp.n.(Nepal),P.prominulus Huang,Li & Yin,2018(China: Jiangxi,Guangxi),P.robustus sp.n.(Nepal),P.rotundatus sp.n.(Nepal),P.saetosus sp.n.(Nepal),P.smetanai sp.n.(Nepal),P.songxiaobini Huang,Li & Yin,2018(China: Xizang),P.sternunicus sp.n.(Nepal),P.suthepensis Huang,Li & Yin,2018(Thailand),P.symmetricus sp.n.(Nepal),P.thailandicus Huang,Li & Yin,2018(Thailand).And a new country record from China: Pselaphodes spinosus Champion,1925(China: Xizang).2.All species treated in this paper are described in detail and compared with similar species.Illustrations of habitus for all species,and major diagnostic characters for all species are given.3.A database including all species of the genus Pselaphodes is built.A taxonomic history,collecting method,distribution and illustrations of major diagnostic characters.4.A list of world Pselaphodes species is provided.5.A key to world species of Pselaphodes is presented.6.The world distribution of Pselaphodes is mapped,and their pattern analyzed.