New Jurassic protopsyllidiids from the Yan’an Formation, North China (Insecta: Hemiptera)

The Middle-Late Jurassic Yanliao biota is a significant paleoecosystem for the understanding of the evolution of Life during the Mesozoic. The origin, distribution, and geology of the Yanliao biota are poorly understood to date. Here we describe and illustrate two new species of protopsyllidiids, namely Sinopsocus yananensis sp. nov. and Subaphidulum sinica sp. nov. from the Middle Jurassic Yan’an Formation near Yan’an City, Shaanxi Province, North China. S. yananensis sp. nov. closely resembles the type species Sinopsocus oligovenus from the Haifanggou Formation at Beipiao City, West Liaoning, Northeast China. The new discoveries not only increase the diversity of Mesozoic protopsyllidiids but also provide thread for understanding the origin of the Yanliao biota.