Analyses of head and thorax in Eupomphini (Meloidae) suggest that complex behaviors are not associated to changes in general shape.

Our results reject an association between general shape of head and thorax with defensive and courtship behaviors in the studied Eupomphini blister beetles. Instead we found that shape of thorax and head radiated in all directions of the morphospace. We also identified a radical separation between two lineages that could represent future evolutionary constraints for thorax evolution.