First record of fossil psocodeans in copula from mid-Cretaceous Burmese amber.

Abstract

We report the first discovery of barklice preserved in copula from amber dating back to the mid-Cretaceous, thus documenting the oldest preserved reproductive behaviour of Psocodea. The new finding provides new insight into the evolution of copulatory behaviour in Trogiomorpha. Moreover, we describe and illustrate the new fossil material of Burmempheria densuschaetae (= Latempheria kachinensis) in the extinct family Empheriidae and Longiantennum fashengi in the extinct family Archaeatropidae, two diverse and widely distributed groups during the Cretaceous. No significant sexual dimorphism is recorded, apart from variation in size where males are larger. The taxonomy of Cretaceous empheriids from Burmese amber is revised and discussed.