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Multivariate regression of overall wing-shape allometry based on 19 wing venation landmarks measured for the forewings of workers and gynes from N2 (n = 86 and 45 specimens, respectively). The graph shows the regression lines (black) of both groups with their 95% confidence interval (gray). Global wing-shape allometry was significant (P = 0.001), as were caste-related differences in wing shape (P = 0.011). The interaction of size and caste was not significant (P = 0.64).
