Serphitoids are a group of proctotrupomorphan wasps that, together with mymarommatoids, are characterized by a bipetiolate metasoma and grouped in the clade Bipetiolarida. The internal relationships of Serphitoidea and Mymarommatoidea are still unresolved, and their biology is poorly known. The fossil record of serphitoids is restricted to Cretaceous, ranging from Barremian to Campanian and is limited to specimens in amber so far. The family Serphitidae encompasses more than 30 species within the subfamilies Microserphitinae, Serphitinae, and Supraserphitinae. The subfamily Microserphitinae is well supported, but the distinctions between serphitines and supraserphitines are somewhat ambiguous. We describe Axioserphites obscurus n. gen. n. sp. from the Barremian (Early Cretaceous) Lebanese amber, belonging to the subfamily Supraserphitinae. We comment on the characters defining this subfamily and discuss its systematic validity. (c) 2025 Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. All rights are reserved, including those for text and data mining, AI training, and similar technologies.