TableĀ 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.

familyspecieshead width (mm)AARPCRMRLR
ZygopteraC. splendens6.120000
EpiophlebiidaeE. superstes7.720000
GomphidaeO. forcipatus9.701100
GomphidaeH. brevistylus10.551001
GomphidaeZ. batesi9.591001
PetaluridaeP. raptor11.611001
PetaluridaeT. thoreyi10.900001
AeshnidaeA. imperator9.881000
AeshnidaeA. mixta8.381001
AeshnidaeA. anisoptera10.691001
AeshnidaeA. isoceles9.610100
AeshnidaeO. pryeri8.530000
AustropetaliidaeP. apicalis9.740000
CordulegastridaeA. sieboldii12.571100
CordulegastridaeC. bidentata8.691100
NeopetaliidaeN. punctata8.970100
LibelluloideaM. taeniolata10.001011
LibelluloideaE. elegans10.780011
LibelluloideaC. aenea8.121011
LibelluloideaS. vulgatum5.220010
LibelluloideaL. depressa8.210010