Agrion puella, (Linnaeus, 1758) (Linnaeus, 1758) " (Skvortsov & Snegovaya, 2015

Kosterin, Oleg E., Onishko, Vladimir V., Ilyina, Elena V., Chepurnov, Grigory Yu. & Blinov, Alexander G., 2024, The genus Coenagrion Kirby, 1890 (Odonata: Coenagrionidae) in the Russian part of the Caucasus, Zootaxa 5471 (2), pp. 151-190 : 186

Key to the species of puella -group in a broad sense

The following simple key may be proposed for the representatives of the puella -group in a broad sense in the Caucasus.

1. Males.............................................................................................. 2

- Females............................................................................................ 5

2. Paraproct spine directed caudad and as long as 5/6 of S10 length in lateral view; pronotum hind lobe almost straight, with scarcely traced lateral depressions and a central notch........................................ C. australocaspicum

- Paraproct spine more or less slanting as to some extent inclining up, not longer than 2/3 of S10 length in lateral view; pronotum hind lobe more or less trilobate.......................................................................... 3

3. Depression between paraproct spine and prominence scarcely expressed, not deeper than rounded rectangular; spine thick; cercus trunk in lateral view slanting as a curve, without expressed apex.................................... C. puella

- Depression between paraproct spine and prominence deep, prominence process-like; cercus trunk in lateral view has an expressed apex....................................................................................... 4

4. Paraproct spine directed more up than behind, so that incision between it and prominence broad; cercus trunk in dorsal view of almost even width.......................................................................... C. pulchellum

- Paraproct spine directed more behind than up, so that incision between it and prominence narrower; cercus trunk in dorsal view broadening................................................................................. C. ponticum

5. Pronotum hind lobe almost straight, with a negligible central notch............................. C. australocaspicum

- Pronotum hind lobe more or less trilobate................................................................. 6

6. Pronotum hind lobe with three strong lobes and deep depressions between them........................ C. pulchellum

- Pronotum hind lobe with smooth lobes and depressions between them........................................... 7

7. Pronotum hind lobe with very smooth lobes of about the same size, with symmetrical shallow depressions between them, S8 black optionally with small blue markings........................................................... C. puella

- Pronotum hind lobe with better expressed lobes, with the central one larger, and asymmetrical incisions between them; S8 largerly blue................................................................................ C. ponticum