Coenagrion puella Linnaeus, 1758 ♂
Common names: Azure Damselfly, Azure Bluet [En], Agrion jouvencelle [Fr], Azuurwaterjuffer [Nl], Hufeisen-Azurjungfer [De]
Meise, BRABANT ● Belgium
IUCN Status: Least Concern (LC)
Description : Adult males have a head and thorax patterned with blue and black. They have an azure blue abdomen patterned with black markings. The marking on the second segment of the abdomen is U-shaped, separated from the segment's narrow terminal black band. (This distinguishes it from the Variable Damselfly Coenagrion pulchellum where the U-shape is joined to the terminal band with a black line.)
Segments three to five are blue with broader black terminal bands, lacking the forward-pointing projection the upper surface which adult male Common Blue Damselfly Enallagma cyathigerum has. Segment six has a similar pattern but with more restricted blue and a broader area of black, and segment seven is mostly black, with just a narrow blue area at the base. Segment eight and much of segment nine are sky-blue, forming a noticeable contrasting patch, but there are small dark markings on the rear upper side of segment nine, which adult male Common Blue Damselfly does not possess.
Adult females There are two colour forms, blue and green. The blue form is similar to the female of the Variable Damselfly Coenagrion pulchellum, but can best be distinguished by examining the shape of the pronotum. It can be distinguished from females of the Common Blue Damselfly Enallagma cyathigerum by the absence of a spine below the 8th abdominal segment.
They have a head and thorax pattern similar to that of the male, but with dull green replacing the blue colour. The abdominal segments are largely black in colour, with narrow pale markings at the junction between each segment.
Key identification features:
• In males there is a characteristic black U-shaped mark on the second abdominal segment which is separate from the black ring at the bottom of the segment
• In segments 4-6 there is more blue/less black in comparison with Coenagrion pulchellum
• In males the blue dorsal thoracic stripes are always complete and only slightly waisted
• The hind margin of the pronotum is broad and flattened
• Females are best identified by examining the shape of the posterior lobe of the pronotum
• In females there are two black stripes on the side of the thorax
• There is no spine below the 8th abdominal segment
The nymphs are usually green with browner wing buds and lamellae. They develop in one year (two in the north), feeding among submerged vegetation and on small invertebrates.
Biology: Adults can be seen between May and August according to locality.
Habitat: A lowland species avoiding exposed and upland sites, as well as all but the slowest flowing rivers.
Distribution: Coenagrion puella is common in most of central and southern Europe to central Asia. It is native from Scandinavia to Spain and Morocco to the South and to Russia, Mongolia and Turkmenistan to the East.
Nelson, B., Thompson, R. & Morrow, C., 2000. [In] DragonflyIreland
Wikipedia, Azure Damselfly
IUCN Red List