Figure 1.
Morphology of the snap-jaw Dracula ant, Mystrium camillae. (a) Still image of a major worker with mandible tips touching in preparation for a strike. (b) Three-dimensional surface rendering of the head (grey), mandible (brown), adductor muscle (yellow), and abductor muscle (blue) involved in mandible movement. (c) Surface model of the mandible displaying some measurements for kinematic analysis and parameters for finite-element analysis. Blue dots represent points of finite-element model constraint (ventral condyle not visible). d, in-lever length between mandible centre of rotation and point of muscle attachment; Fadd, force applied to mandible by mandible adductor muscle; r, mandible length.