Table 1.
Taxon sampling used and overview of head sizes and mandible ridge presence. AAR, anterior acetabular ridge; PCR, posterior condylar ridge; MR, median ridge; LR, lateral ridge.
| family | species | head width (mm) | AAR | PCR | MR | LR |
|---|---|---|---|---|---|---|
| Zygoptera | C. splendens | 6.12 | 0 | 0 | 0 | 0 |
| Epiophlebiidae | E. superstes | 7.72 | 0 | 0 | 0 | 0 |
| Gomphidae | O. forcipatus | 9.70 | 1 | 1 | 0 | 0 |
| Gomphidae | H. brevistylus | 10.55 | 1 | 0 | 0 | 1 |
| Gomphidae | Z. batesi | 9.59 | 1 | 0 | 0 | 1 |
| Petaluridae | P. raptor | 11.61 | 1 | 0 | 0 | 1 |
| Petaluridae | T. thoreyi | 10.90 | 0 | 0 | 0 | 1 |
| Aeshnidae | A. imperator | 9.88 | 1 | 0 | 0 | 0 |
| Aeshnidae | A. mixta | 8.38 | 1 | 0 | 0 | 1 |
| Aeshnidae | A. anisoptera | 10.69 | 1 | 0 | 0 | 1 |
| Aeshnidae | A. isoceles | 9.61 | 0 | 1 | 0 | 0 |
| Aeshnidae | O. pryeri | 8.53 | 0 | 0 | 0 | 0 |
| Austropetaliidae | P. apicalis | 9.74 | 0 | 0 | 0 | 0 |
| Cordulegastridae | A. sieboldii | 12.57 | 1 | 1 | 0 | 0 |
| Cordulegastridae | C. bidentata | 8.69 | 1 | 1 | 0 | 0 |
| Neopetaliidae | N. punctata | 8.97 | 0 | 1 | 0 | 0 |
| Libelluloidea | M. taeniolata | 10.00 | 1 | 0 | 1 | 1 |
| Libelluloidea | E. elegans | 10.78 | 0 | 0 | 1 | 1 |
| Libelluloidea | C. aenea | 8.12 | 1 | 0 | 1 | 1 |
| Libelluloidea | S. vulgatum | 5.22 | 0 | 0 | 1 | 0 |
| Libelluloidea | L. depressa | 8.21 | 0 | 0 | 1 | 0 |