Fig. 1 in Strong phylogenetic constraint on transition metal incorporation in the mandibles of the hyper-diverse Hymenoptera (Insecta)

Fig. 1 SEM pictures of mandibles and representative spectra (on base-10 logarithmic scale) from X-ray energy-dispersive analysis of mandible teeth, generated with a primary electron beam energy of 20 keV. a, b Camponotus cruentatus (Formicidae); c, d Ibalia rufipes (Ibaliidae); e, f Isodontia mexicana (Sphecidae); g, h Argidae sp. Note that Zn occurs only in a and b, and Mn occurs only in b. Squares in the SEM pictures indicate the area of the mandibles where the EDS point analysis was done. Peaks for transition metals (Zn and Mn), for Cl (the halogen co-associated with Zn), and for the basic elements of the cuticle (C and O) are highlighted