Heliaeschna trinervulata from Chingombe, Zambia: male (a–d) and female (e), with recognisable diagnostic morphological traits such as: relatively open venation (a, e) with a low number of cross-veins (e.g. Ax and Mx), the pale frons with a barely marked cross-bar of T-mark (b, e), wing bases without dark subcostal rays (a, e) but with distinct amber tint in the female (e) and shape of male cerci (c, d) (phot. B. Daraż).