Taxonomic, Faunistic And Phylogenetic Studies On The Subfamily Euscelinae From China (Homoptera: Cicadellidae)

The present dissertation is a systematic study on the subfamily Euscelinae from China. The history and current situation of the subfamily both in China and abroad were summarized in the general account. The species and their distribution of the subfamily in China were studied extensively and intensively based on the material from the major insect collections in China. The phylogeny of the subfamily were analyzed based on the data combining both morphological characters and gene sequences (the D2 variable region of 28S and 16S rDNA) by using PAUP * 4.0 and MrBayes3.0. The type and specimens studied were deposited in the Institute of Entomology of Guizhou University, and Department of Plant Protection of Zhcjiang University except for the borrowed ones which are kept in their original institutions.239 species of 62 genera belonging to 8 tribes had been studied, among them, two genera and 28 species are described as new to science, and one species reported for the first time from China. All of these new genera, new species and newly recorded species are listed as follows:New genera: Trineurota gen. nov.; Paramacrosteles gen. nov..New species: Hishimonus prolongatus sp. nov.; Hishimonus fuscoinaculatus sp. nov.; Phlogotettix nigriveinus sp. nov.; Trineurota hengvitta sp. nov.; Paivanana centristriata sp. nov.; Scaphoideus transvittatus sp. nov.; Scaphoideus multipunctus sp. nov.; Scaphoideus harpagous sp. nov.; Scaphoideus conicaplateus sp. nov.; Scaphoideus palingus sp. nov.; Scaphoideus fanjingensis sp. nov.; Scaphoideus curvanus sp. nov.; Scaphoideus hamulus sp. nov.; Scaphoideus nigrivalveus sp. nov.; Scaphoideus zangi sp. nov. ; Balclutha brownstripa sp. nov., Balclulha clockstripa sp. nov. ; Balclutha fuscoinaculatus sp. nov.; Yamatotettix nigrilineus sp. nov.-, Sorhoanus binotalus sp. nov.; Macrosteles tibetaensis sp. nov.; Macroslelel bipunclatus sp. nov.; Macrosteles latiaedeagus sp. nov.; Macrosteles bimaculata sp. nov.; Macrosteles huangheus sp.nov.; Paramacrosteles nigromaculatus.sp. nov.; Xestocephalus pianmaensis sp. nov.; Xestocephalus spineslyleus sp. nov..Newly recorded species: Nandidrug viridicans Distant.The faunal structures of the Chinese Euscelinae at generic and specific levels were examined. 62 known genera constitute 14 types of distribution in Zoogeographic regions in the world. Among them, 26 genera are distributed in Oriental + Palaearctic region, which make up 41.94%, while 11 genera in Oriental region and 4 genera in Palaearctic region, accounting for 17.74% and 6.45%, respectively. 57 genera in total distribute in Oriental region, accounting for 91.94%. It isclear that Oriental genera make up the majority of the Chinese Euscelinae at generic level. 7 genera in total were endemic in China, which account for 11.29%.239 known species of the Chinese Euscelinae are mainly distributed in Oriental region, in which the number of species makes up 64.29% of the Chinese species in total. All the known species constitute 24 types of distribution in seven Chinese Zoogeographic sub-regions. Among them, 64 species are present only in South China sub-region, 40 in Central China sub-region, 23 in Central China + South China sub-region, accounting for 26.78%, 16.74% and 8.62%, respectively. The other types account only for a very low percentage. It is obvious that Oriental species make up the majority of the Chinese Euscelinae at specific level and they distribute mainly in South China and Central China Sub-region.The phylogeny of this subfamily were studied by using two analysis softwares (PAUP * 4.0 and MrBayes3.0) based on 102 morphological characters combined with gene sequences of 28S D2 rDNA and 16S rDNA with the tribe Empoascini as the outgroup.The phylogenctic tree of the subfamily Euscelinae resulted from the data combined morphological characters with two gene sequences had eight obvious clades, roughly corresponding to the existing eight tribes. The tribe Macrostelini formed a single clade, representing a monophyletic group and occupying a basal position in the phylog...