Figure 2 from: Mitra A (2013) Function of the Dufour's gland in solitary and social Hymenoptera. Journal of Hymenoptera Research 35: 33-58. https://doi.org/10.3897/jhr.35.4783

Figure 2 - Diagram listing the categories of compounds reported from the Dufour's gland in various hymenopteran taxa, also showing the inter-relationships of the taxa. Dendrogram made following Brothers (1998), Schmitz and Moritz (1998), Whitfield and Cameron (1998), Grimaldi and Engel (2005), Brady et al. (2009), Vincent et al. (2010), and Cardinal et al. (2010). References cited in parenthesis below the names of compounds. Branch lengths do not have any significance.