Fig. 4
From: The loss of flight in ant workers enabled an evolutionary redesign of the thorax for ground labour
Impact of loss of wing muscles on geometry of leg muscles and petiole levators in Euponera sikorae. a In queens, wing muscles fill the thoracic cavity, limiting the size of leg and petiole muscles. b In workers, the external trochanter muscles (orange) of the midlegs (IIscm6) and hindlegs (IIIscm6) are extended to originate high on the roof of the mesothorax (T2) and the lateral walls of propodeum (IA) respectively, while the levators of the petiole (green) are larger and fill up almost the entire propodeal cavity