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An unusual new genus and species of beaded lacewings (Neuroptera: Berothidae) from the mid-Cretaceous Burmese amber

A new genus and species of the neuropteran family Berothidae from the mid-Cretaceous Burmese amber, namely Xiaoberotha bipunctata gen. et sp. nov., is described. In addition, an undetermined species of this new genus is also described. This new genus greatly differs from most known berothids by the presence of forewing ScA and the configuration of hind wing Cu that is not approximating posterior wing margin. The new genus superficially resembles Hemerobiidae by having the distinct, posteriorly curved forewing ScA and the two forewing cua-cup crossveins that are shared by many brown lacewing genera. However, no autapomorphy of Hemerobiidae could be confirmed to be present in the new species. Here we tentatively place this new genus in Berothidae by the configuration of the female gonocoxites 8, which is conspicuous and dorsoventrally extended. This unusual beaded lacewing genus highlights the morphological diversity of the extinct Berothidae.