Figure 9. A in The male genital tract and aedeagal components of the Diptera with a discussion of their phylogenetic significance

Figure 9. A possible phylogenetic arrangement of Diptera showing the distribution of internal male genitalic features. Black bars indicate the apomorphic condition and grey bars indicate reversals to the plesiomorphic condition. The numbers refer to characters listed below, which are discussed further in the text and scored in the data matrix (Table 2): 1, U-shaped vasa deferentia; 2, accessory gland continuous with vasa deferentia; 3, epididymus present; 4, apical fusion of vasa deferentia absent; 5, multichambered accessory gland; 6, sliding ejaculatory apodeme; 7, ejaculatory apodeme absent; 8, aedeagus membranous; 9, ventral plate present.