Re-description and systematics of Paraulacus sinicus Ping, 1928 (Insecta, Hymenoptera)

Paraulacus sinicus Ping, 1928 was originally assigned to Aulacidae (Hymenoptera, Evanioidea), later transferred to Mesoserphidae (Hymenoptera, Proctotrupoidea), and even considered as order incertae sedis in the infraclass Neoptera. Re-description of the holotype indicates that the species should be attributed to either Mesoserphidae or Roproniidae in the Proctotrupoidea, a superfamily of parasitoid wasps. The species is considered to have been collected from the Middle Jurassic Haifanggou Formation and not from the Lower Cretaceous as in the original description.