Fig. 10 in The specialized thoracic skeletomuscular system of the myrmecophile Claviger testaceus (Pselaphinae, Staphylinidae, Coleoptera)

Fig. 10 Hypothetical steps in the evolution of the prothorax in Claviger, ventral view. a groundplan (prosternum separated from undivided hypomera by complete notosternal sutures); b hypomera subdivided by hypomeral ridges (inner portion of hypomeron thickened, reinforces adcoxal region); c prosternum fused with hypomera (notosternal sutures