Figure 7 from: Dong R, Qiao X, Shih C, Petrulevičius J (2013) Fossils from the Middle Jurassic of China shed light on morphology of Choristopsychidae (Insecta, Mecoptera). ZooKeys 318: 91-111. https://doi.org/10.3897/zookeys.318.5226

Figure 7 - The ratio of forewing length (L)/width (W) vs. forewing length (in mm) of ten representative Families of Mecoptera. For all data points, the linear regression trend line is represented by Y1 = 0.036*X + 2.620. Excluding the data of Panorpidae, the linear regression trend line is Y2 = 0.056*X + 1.977.