New Archexyelinae (Hymenoptera: Xyelidae) from the Triassic Madygen Formation of Kyrgyzstan.

One new genus and three new species of Archexyelinae (Xyelidae) are described from the Middle–Late Triassic Madygen Formation of Kyrgyzstan, including Xyelinus scherbachov sp. nov., Triassoxyela sharovi sp. nov., and Microxyela minuta gen. et sp. nov. Xyelidae is the most ancient hymenopteran family in fossil records and the only one known from the Triassic. Triassic xyelids are known from five localities throughout the whole Pangaea. The most diverse and abundant Triassic xyelid fauna comes from Madygen, with 16 genera and 34 species in the two subfamilies Archexyelinae and Madygellinae. [ABSTRACT FROM AUTHOR]