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Factor map of the principal component analysis (PCA) of the scutal seven-landmark residual coordinates after Procrustes superposition. A posteriori convex hulls were drawn to compare S1 (club-shaped sensilla) and S2 (rounded sensilla). The horizontal axis is the first principal component (PC1) and the vertical axis is the second principal component (PC2), with 42 % and 16 % their respective contributions to the total variation of shape.
