COMPARISON OF PRONOTUMS OF BLUE DAMSELFLIES

The shape of the hind margin of the pronotum is diagnostic in blue damselflies. The illustrations below are of male insects however the shape is similar in both sexes.

Common Blue Damselfly
Enallagma cyathigerum

The hind margin has a flat, shallow central lobe
Azure Damselfly
Coenagrion puella

The hind margin is broad and flattened
Variable Damselfly
Coenagrion pulchellum

The hind margin has a prominent, narrow central lobe
Irish Damselfly
Coenagrion lunulatum

The hind margin has a distinct raised lobe

Nelson, B., Thompson, R. & Morrow, C., 2000 (August 28). [In] DragonflyIreland http://www.ulstermuseum.org.uk/dragonflyireland/


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