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The First Xyelotomidae (Hymenoptera) From the Middle Jurassic in China

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Three new genera with three new species and two new species of two known genera, all in the family of Xyelotomidae (Hymenoptera), are described and illustrated. These specimens were collected from the Middle Jurassic of Daohugou, Jiulongshan Formation, and the Late Jurassic to Early Cretaceous of Dawangzhangzi, Yixian Formation, of China. A key to the known and new genera of Xyelotomidae is provided. Fourteen fossil genera with 20 species found so far from the Early Jurassic to the Early Cretaceous imply that Xyelotomidae was diverse and abundant during that period. New findings reported here provide additional evolutionary and transitional evidence of forewing Sc vein changed from two-branched to one-branched, to two separate parts, to apical part forming a crossvein, and finally to vestigial in Xyelotomidae from the Early Jurassic to the Early Cretaceous.

Keywords: China; Jiulongshan Formation; Middle Jurassic; Xyelotomidae; new genera

Document Type: Research Article

DOI: http://dx.doi.org/10.1603/008.102.0402

Publication date: July 1, 2009

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  • Annals of the Entomological Society of America is published in January, March, May, July, September, and November. Annals especially invites submission of manuscripts that integrate different areas of insect biology, and address issues that are likely to be of broad relevance to entomologists. Articles also report on basic aspects of the biology of arthropods, divided into categories by subject matter: systematics; ecology and population biology; arthropod biology; arthropods in relation to plant diseases; conservation biology and biodiversity; physiology, biochemistry, and toxicology; morphology, histology, and fine structure; genetics; and behavior.
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