The variability of a random sample (28 ď of E. v. viridulum (Dept Moselle) was studied. This population clearly resembles the Syrian population of E. v. orientale in coloration. A difference in hindwing venation seems to be the only distinctive feature between the nominate ssp. (Europe, Turkey) and E. v. orientate. Specimens from Morocco are also referable to the nominate ssp.

Notulae odonatologicae

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Societas Internationalis Odonatologica

J.-P. Boudot, & G. Jacquemin. (1988). A note on the variability of a population of Erythromma viridulum (Charp.) from eastern France, with special reference to E. viridulum orientale Schmidt (Zygoptera: Coenagrionidae). Notulae odonatologicae, 3(2), 17–19.