Common Blue Damselfly Enallagma cyathigerum

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Length

32mm, Wings 36-42mm

Male

Bright blue body with black markings on upper surface of abdomen, segment 2 has lollipop mark; segment 8 and 9 all blue; broad antehumeral stripes on black thorax; eye spot linked by bar.

Male Common Blue Damselfly at Broomfleet Washlands on 23/05/2010 - © Paul Ashton.

 

Female

3 colour forms:-
1) abdomen with black markings.
2) Green with black markings.
3) Brown with black markings. All have characteristic medial spine under segment 8, presumably puncturing plant material before inserting an egg.

17062010-comblu-female-reiverhertford-paulashton

 

Gallery

Common Blue Damselfly Gallery

Habitat

Canals, gravel pits, lakes, ponds and slow moving rivers.

Behavior

Pairs lay eggs into stems of vegetation, female often immersing, when male will detach from her. Male will pull her out if she has difficulty. Larvae 2 years. Adults feed around grasses catching small insects.

Flight Period

Mid-May to late September.

Status

Occurs on a wide range of varying water-bodies. Can be more conspicuous than the similar Azure Damselfly. Blue damselflies ranging far over open water are usually this species. Generally the most abundant blue damselfly at sites, where the Azure can be absent.

Locations

common-blue-damselfly-enallagma-cyathigerum