Figure 2. A hypothetical forewing of the Lepidoptera and Trichoptera.

(A), A hypothetical forewing of the Lepidoptera modified after Kristensen & Skalski [15]; red line indicates that M₁, after separation from M_2, subtends an angle greater than 60 degrees and is sharply angulate at the junction with the r–m crossvein. (B), A hypothetical forewing of the Trichoptera modified after Holzenthal et al. [36]; red line indicates the separation of M₁₊₂, and M₁ consisting of smooth and sublinear veins. Abbreviation: ny, nygmata.