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Southern Damselfly

Coenagrion mercuriale
Southern damselfly (Coenagrion mercuriale) male Parsonage Moor.jpg
Male Parsonage Moor, Oxfordshire
Southern damselfly (Coenagrion mercuriale) female Dry Sandford.jpg
Female, Dry Sandford Pit, Oxfordshire
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Odonata
Family: Coenagrionidae
Genus: Coenagrion
Species: C. mercuriale
Binomial name
Coenagrion mercuriale
(Charpentier, 1840)

Coenagrion mercuriale, the southern damselfly, is a species of damselfly in the family Coenagrionidae. It is found in Algeria, Austria, Belgium, France, Germany, Italy, Liechtenstein, Luxembourg, Morocco, the Netherlands, Portugal, Slovakia, Slovenia, Spain, Switzerland, Tunisia, and the United Kingdom. Its natural habitats are rivers and freshwater springs. It is threatened by habitat loss.

The specific part of the scientific name, mercuriale, is because of the distinctive markings on the second segment of the abdomen that resembles the astrological symbol for the planet Mercury - . This also gives the species an alternative common name of mercury bluet.

They require areas of open vegetation, mixed with slow flowing water in which to lay their eggs.

The larvae spend 2 years underwater before emerging as damselflies.

It is thought that 25% of the world population exists within the United Kingdom but it has declined by 30% since 1960 due to changes in grazing, land drainage and water abstraction.


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