B. anynana is both phenotypically plastic and sexually dimorphic for facet lens area. (a) Ommatidia of a wet season female specimen showing the lateral region of the eye in which facet lens area was calculated for each eye. (b) Mean facet size (lens area) for each sex and seasonal form. (c) Mean number of facets per individual per eye calculated from facet size and eye size. Error bars indicate 95% CI of means.