Landmarking and sliding
Each 3D model was landmarked in Viewbox version 4.0 (dHAL
software, Kifissia, Greece; http://www.dhal.com; Polychronis et al.,
2013). One operator (first author)manually placed the fixed landmarks
and curves. Curve semilandmarks were placed equidistantly and then were
allowed to slide along their respective curves. Surface semilandmarks
were placed following a thin-plate spline interpolation between the
template and each specimen, followed by a projection to the surface of
the 3D-model and the sliding procedure. Sliding was performed by
minimizing the bending energy.