Abstract
The extinct, exclusively Cretaceous wasp family Maimetshidae is newly recorded from Earliest Cenomanian Burmese amber. Two new genera and species are described. Burmaimetsha concava gen. et sp. nov., based on a male and a female, is most similar to Guyotemaimetsha Perrichot, Nel & Néraudeau, from Albian-Cenomanian French amber, but differs in its larger mandibles, distinctly concave face, elongate antennomeres, and forewing with cell [1Rs] smaller and fourth abscissa of Rs shorter. Maimetshasia kachinensis gen. et sp. nov., is based on a male, and is characterized by asymmetric mandibles with two and three teeth, by its forewing venation without cross-vein 2rs-m, with cell [1M] large and trapezoidal, and vein 2Rs+M very short, and by the hind wing without a free apex of Rs. The family was evidently widespread in the Cretaceous, and the new records extend the paleobiogeographical range to the South-East of Eurasia. A discussion about the possible biology of Maimetshidae is provided.
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