Fig. 2

Landmarks and linear distances used in the toad skulls. Numbered landmarks in both sides of the skull are shown as red dots in dorsal (a) and ventral (b) views, and only landmarks of the right side of the skull are shown in the lateral (c) view (descriptions in Table 1). Landmarks were placed in bone sutures or bone processes either with TINA-Landmark software in 3D images or with a 3D digitizer in the real skulls. Linear distances are shown as white lines and represent individual bone dimensions, as shown in Table 2