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One hundred equidistant landmarks on a left ariid opercle (Notarius quadriscutis). The starting and end point of landmark capturing is indicated by a bold red dot, representing a Type 2 landmark, the local maximum of the curvature on the ventral part of the anterior edge. Ninety‐nine sliding semilandmarks were equally spaced capturing the outline of the opercle bone. Direction of landmark recording along the outline is indicated by an arrow.
