|Publication Type:||Conference Paper|
|Year of Publication:||2016|
|Authors:||Zhang, Q, Zhang, H-C|
|Conference Name:||The 7th International Conference on Fossil Insects, Arthropods and Amber|
|Publisher:||Siri Scientific Press|
|Conference Location:||National Museum of Scotland, Edinburgh|
The subfamily Angarosphecinae is an extinct group within the Sphecidae (Insecta: Hymenoptera) ranging in age from the Cretaceous to the Eocene and abundant in various parts of Eurasia and South America. An examination of all the reported fossil wasps assigned to Angarosphecinae indicated 49 species within 14 genera, of which seven species (in four genera) are known from China. A recent study of wasps from the Lower Cretaceous Yixian Formation of western Liaoning and southeastern Inner Mongolia showed that more than 100 specimens could be assigned to some 20 species within seven genera of the Angarosphecinae. Our analysis indicates a great change in species diversity occurring in this group of wasps. The subfamily first appeared in the earliest Cretaceous (Berriasian) and entered a stable developmental stage during the Valanginian–Barremian, along with a gradually extending geographic distribution. This group underwent a significant adaptive radiation in the Aptian but experienced a mass extinction near the Aptian–Albian boundary. It seems that this subfamily survived the catastrophe, but became extinct probably after the Eocene.