Order Vespida see Order Hymenoptera Linnaeus, 1758
   Suborder Siricina
     Family Xyelidae Newman, 1834
       Subfamily Xyelinae Newman, 1834
         Genus Xyela Dalman, 1819
           1 Subgenus †Mesoxyela
           2 Xyela julii Brébisson, 1818