Fig. 3: Odonata Steleopteridae with specialized zones probably producing light flashes.
From: Sound vs. light: wing-based communication in Carboniferous insects
a Parasteleopteron guischardi Fleck et al.33 (Jurassic), holotype SOS 3615. False colors showing the relative reliefs of surfaces; arrow specialized zone; deep zones in red, higher zones in yellow. b Steleopteron cretacicus Zheng et al.34 (Lower Cretaceous), showing differences of luminosity of parallel surfaces in specialized zone. RP2, RP3/4 branches of radius posterior, IR2 longitudinal intercalary vein. Scale bar: 2 mm.
