Figure 1. Measurement points of laterality in Exodon paradoxus for the mandible height and head inclination.

Photographs of (a) the left and right mandibles and the height measurements (L and R) between the socket bottom and ventral corner of the retroarticular, (b) the head and vertebrae in the ventral views and their angle (θ), and (c) transparent specimens of lefty and righty individuals in the ventral view. Note that in (c), the lines between the right and left ventral corners of the retroarticular do not cross perpendicularly to the vertical lines that indicate the midlines of the bodies, but rather slant to the left or right in the lefty and righty, respectively.