Two Insect Fossils From The Miocene Amber In Zhangpu,Fujian

As an important transitional period of the Cenozoic Era,the Miocene is rich in flora and fauna.The morphological characteristics of the Cenozoic Era are highly comparable with the living plants and animals,so it has been the focus of scholars.In recent years,a large number of plant fossils including Dipterocarpaceae have been found in the Zhangpu area of Fujian Province in the southeastern of China.Some amber fossils also have been found,and analysised by geochemical technology come from the Dipterocarpaceae.As an important preservation medium for insect fossils,amber has always been a research hotspot in the international ancient insects academic community.It is known that the plant fossils in the Zhangpu area are very rich,but there are few reports about insect fossils in amber.This paper reports two insect fossils in amber in Zhangpu,Fujian.they provide important fossil evidence for the biodiversity and systematic evolution of the Miocene Cecidomyiidae and Eulophidae insects in the southeastern of China.The amber fossils were carefully polished by grinding method and polishing method.The morphology of two insect fossils in Fujian Miocene Amber was described and identified in detail.the systematic classification and retrieval tables of the subfamilies of the Cecidomyiidae and Eulophidae were reorganized.And 1undetermined species of Alatostyla and 1 new genus and 1 new species of Eulophidae are confirmed.They are Cecidomyiidae Alatostyla sp.and Eulophidae Maatus YJ Li et BN Sun gen.nov.,Maatus fujianensis YJ Li et BN Sun sp.nov..which is the only fossil record of the insects of China of the Cecidomyiidae and Eulophidae in the Miocene.In this paper,we discussed the origin and evolution of the subfamilies of Cecidomyiidae from its feeding habits and fossil records.It is believed that the Cecidomyiidae insects originated in the late Jurassic period to early Cretaceous,and the Catotrichinae,the ancestral group,is the oldest group in the Cecidomyiidae.Other subfamilies have evolved from their ancestral groups.The Cecidomyiinae has thehighest degree of differentiation.The evolutionary path of the feeding habits of the Cecidomyiidae is evolved from mycophagous to herbivorous and predatory.Finally,using the characteristics of the notauli of the Eulophidae,we discussed and confirmed the ancestral group status of the Tetrastichinae in the Eulophidae.And the Entedoninae has the highest degree of differentiation.