DISCOVERY OF TREMATOTHORACINAE (INSECTA) IN THE UPPER JURASSIC OF W. LIAONING

A new genus and new species, Trematothoracoides liaoningensis gen. et sp. nov., is described here from the lower part of the Upper Jurassic Yixian Formation at Huangbanjigou Village near Shangyuan Town, Beipiao, Liaoning Province, China. This is the first reliable trematothoracin sawfly discovered in China and in the Jurassic Period. The cladistic analysis of Trematothoracinae shows that the subfamily is monophyletic. Trematothoracoides is relatively primitive and forms the sister group to a clade that includes Thoracotrema, Prosyntexis and Trematothorax. Thoracotrema and Prosyntexis are a closely related sister group, which is also the sister group to Trematothorax .

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Clc Number:

Q915.819.7