The statistical examination confirmed that the males and females of C. balcanica have significantly more antenodal crossveins, crossveins in the discoidal cell and cubito-anal crossveins, and more cells in anal-loops than do those of C. s. ancilla. This can be used to discriminate the occasional heterochromatic females of C. balcanica from the regular heterochromatic females of C. s. ancilla.

Odonatologica

CC BY-SA 4.0 NL ("Naamsvermelding-GelijkDelen")

Societas Internationalis Odonatologica

Ž.R. Adamović, & S.T. Vijatov. (1996). Morphometric examination of Calopteryx balcanica Fudakowski, 1930 and C. splendens ancilla Selys, 1853 (Zygoptera: Calopterygidae). Odonatologica, 25(2), 109–118.