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Fig. 8. | BMC Biology

Fig. 8.

From: Wonky whales: the evolution of cranial asymmetry in cetaceans

Fig. 8.

Visualisation of p (radii) from landvR showing asymmetry in the dolphin skull. Landmarks are placed on a stylised outline of a dolphin skull. The 3D surface scan of a dolphin skull (inset) is shown for orientation and is Lissodelphis borealis USNM 550188. The white spheres on the landvR output show the fixed landmarks (1–66) on the left-hand side (LHS) of the skull (looking down on the skull with the rostrum pointing north). The landmarks on the right-hand side (RHS) of the skull vary in colour depending on how much difference there is between a computer -mirrored landmark (Rn) (which assumes the skull is bilaterally symmetrical) and a manually placed landmark (Fn) (which accurately depicts asymmetry). The larger the difference between the computer -mirrored landmark and the manually placed landmark, the hotter the colour. The highest amount of asymmetry is shown in red and dark orange, less asymmetry is shown in pale orange and yellow. Note the red landmarks on the nasal and posterior premaxilla of this odontocete. The tails coming from each of the landmarks show how much and in which direction the landmarks have moved from where the computer mirrored them, to where the landmarks sit when manually placed

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