A taxonomic synopsis and identification key to the genera of the Myaptex group (Diptera, Asilidae, Asilinae), with description of a remarkable new genus and three new species from the South American Chaco

Cardiasilus aysu sp. nov. (male holotype) A, B habitus lateral and dorsal, respectively C head and thorax, lateral view D head, anterior view E, F antenna, lateral and dorsal views, respectively G wing H abdomen, ventral view. Abbreviations: d = discal cell; m3 = third medial cell; r1 = first radial cell; r2+3 = second + third radial cell; R2+3 = second branch of radius; R4 = upper branch of third branch of radius; R5 = lower branch of third branch of radius.