Extreme asymmetric morphologies are hypothesized to serve an adaptive function that counteracts sexual selection for symmetry. However direct tests of function for asymmetries are lacking, particularly in the context of animal weapons. The weapon of the maritime earwig, Anisolabis maritima, exhibits sizeable variation in the extent of directional asymmetry… CONTINUE READING
Fig. 2: An agonistic encounter between two male maritime earwigs. (a) The two males align bodies, facing in opposite directions. (b) The attacking male (on right) uses right (curved) forcep to grab the dorsal region of an opponent’s abdomen. Illustrations by Christopher Quock.