No abstract

BioOne (www.bioone.org) is a nonprofit, online aggregation of core research in the biological, ecological, and environmental sciences. BioOne provides a sustainable online platform for over 170 journals and books published by nonprofit societies, associations, museums, institutions, and presses.Your use of this PDF, the BioOne Web site, and all posted and associated content indicates your acceptance of BioOne's Terms of Use, available at www.bioone.org/page/terms_of_use.Usage of BioOne content is strictly limited to personal, educational, and non-commercial use. Commercial inquiries or rights and permissions requests should be directed to the individual publisher as copyright holder. A new family Vosegidae is described for Vosegus triassicus gen. et sp. nov. from the Anisian (early Middle Triassic) Grès à Voltzia Formation of the Vosges (north−eastern France). This is the oldest Aphidomorpha presenting the combi− nation of characters as: elongate and tapered pterostigma with straight posterior margin, thick common stem of veins Sc+R+(M)+CuA, arcuate RP separated well basad of pterostigma base, three−branched M with free base, CuA forked, veins not differentiated in their thickness. The morphological characters presented by Vosegus are spread among the different extinct and extant lineages of Aphidomorpha, but the combination presented is unique. The relationships of this new family to other Triassic Sternorrhyncha are discussed, concluding its placement in Aphidomorpha: Triasso− aphidoidea. The specificity of Grès à Voltzia fossil site in respect to early evolution of aphids is presented, with two competing explanations for size diminution, considering the Early Triassic biotic recovery versus the correlation be− tween early aphid diversification and the exploitation of new niches, new host plants and habitats. This new finding in− creases the taxonomic diversity of the Grès à Voltzia fauna, expanding our knowledge of Early Triassic Aphidomorpha diversity and evolution.

Two new ancient griffenflies, members of the Qilianshan Entomofauna from the Namurian B-C (Upper Carboniferous) of Ningxia Hui Autonomous Region, are described. One species, Sinierasiptera jini Zhang, Hong & Su, sp.n., is placed in a new family Sinierasipteridae within Neodonatoptera, and the other, Paragilsonia orientalis Zhang, Hong & Su, sp.n., in Meganeuridae (Tupinae). The phylogenetic position of the new family Sinierasipteridae is discussed.

Shaanxi Entomofauna is important in the study of insect’s evolution from Paleozoic to Mesozoic. A new genus and species, Cathayiblatta longata gen. et sp. nov., of Mylacridae (Blattodea) from Middle Triassic is described. The new genus and species was found in Tongchuan City, Shaanxi Province of China, and the fossil referred to a new member of Tongchuan Entomassemblage of Shaanxi Entomofauna. The ultrastructure of wing was observed through scanning electron microscope. Comparison was made between the new genus and related genera Hemimylacris and Metaxyblatta.

According to a systematic study of large numbers of fossil insects collected from the Paleozoic, Mesozoic and Tertiary strata in North China, three evolutionary mega-stages of fossil insects including 14 fossil entomofaunas and 29 entomassemblages have been established. These insect faunas reflect their order or law of evolution-the history of their rise and fall, and form their evolutionary succession in North China. Such a history provides an important reference not only for understanding fossil insects through time, but also showing for stratigraphical correlation.