New wood soldier flies from mid-Cretaceous Myanmar amber (Diptera, Stratiomyomorpha, Xylomyidae)

Two new wood soldier flies, Clemoxyla aculeolata gen. et sp. nov. and Archeoxyla gigantea gen. et sp. nov., are described from mid-Cretaceous Myanmar (Burmese) amber. Clemoxyla gen. nov. is most characteristic of the broadened cell d and presence of short M1+2 stem after the cell d. The apical palpus of Archeoxyla gen. nov. is obviously expanded that is distinct from other known fossil xylomyid genera. Based on the analysis of key features of body and venation, the genus Cretarthropeina Solórzano Kraemer and Cumming, 2019 is transferred from Xylomyidae to Stratiomyidae as the sixth soldier fly from mid-Cretaceous Myanmar amber. In addition, a key to the genera of all known fossil and extant xylomyids is provided.