Figure 3 from: Baranek B, Kuba K, Bauder JAS, Krenn HW (2018) Mouthpart dimorphism in male and female wasps of Vespula vulgaris and Vespula germanica (Vespidae, Hymenoptera). Deutsche Entomologische Zeitschrift 65(1): 65-74. https://doi.org/10.3897/dez.65.23593

Figure 3 Head anatomy of a female worker (left) and a male individual (right) of V. germanica (micro CT). Adductor of the mandible (red) is much bigger in females than in males; abductor muscle (blue) is slightly bigger in females; ma – mandible.