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描述产自辽宁北票上园地区黄半吉沟上侏罗统义县组下部膜翅目昆虫化石 1新属新种Trema tothoracoidesliaoningensisgen .etsp .nov .,归入葬茎蜂科 (Sepulcidae)中的陷胸茎蜂亚科 (Trematothoracinae)。这是首次在我国发现可靠的陷胸茎蜂化石 ,也是该亚科在侏罗纪的首次报道。分支分析结果表明Trematothoracinae为一单系类群。Thoracotrema与Prosyntexis进化程度较高 ,构成一对姊妹群 ,同时又是Trematothorax的姊妹群 ;Trematothoracoides最为原始 ,为Thoracotrema +Prosyntexis+Trematothorax的姊妹群
A new species of the genus Trematothoracoideslia iningensisgen.etsp .nov., Belonging to the genus Hymenoptera from the Yixian Formation in the Upper Jurassic, Huangbayitou of Beipiaogou, Beipiao, Liaoning Province, was introduced into Sepulcidae Subfamily (Trematothoracinae). This is the first time in our country to find a reliable dorsal stem bee fossils, but also the first report of the subfamily in the Jurassic. Branching analysis showed that Trematothoracinae is a monophyletic group. Thoracotrema and Prosyntexis have a high degree of evolution, forming a sister group and a sister group to Trematothorax; the most primitive species is the sister group of Thoracotrema + Prosyntexis + Trematothorax