Figure 6 from: Thorne B, Johnson S, Breisch N, Momen B (2011) Morphology and gonad development of normal soldiers and reproductive soldiers of the termite Zootermopsis nevadensis nevadensis (Isoptera, Archotermopsidae). ZooKeys 148: 15-30. https://doi.org/10.3897/zookeys.148.1672

Figure 6 - Correlation between testis diameter at the widest point and the ratio of mandible length to labrum length in male soldier morphs (soldiers and reproductive soldiers).