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Field Guide
🐛

Emerald Damselfly

Lestes sponsa

Not yet photographed by the community

Metallic green; rests with wings half open.

Species Profile

Green List; widespread and common across suitable habitats in the UK
Lifespan
1 year; adults active from June to October
Size & Weight
28–34 mm body length; wingspan 32–38 mm
Habitat
Still and slow-moving freshwater bodies including ponds, ditches, fens, and boggy areas with emergent vegetation.
UK Distribution
Found throughout England, Wales, and southern Scotland; resident species with populations present from June onwards; absent from far northern regions.
Diet
Small flying insects including midges, gnats, and other tiny invertebrates; hunts by perching and making quick aerial sallies.
Prey
Midges, gnats, small flies, and other aquatic and terrestrial insects
Predators
Robber flies, larger dragonflies, birds (including reed warblers and reed buntings), and aquatic predators of nymphs such as fish and diving beetles
Mating Season
June to September
Breeding
Females lay eggs singly into plant stems (endophytic oviposition) above the waterline; eggs overwinter and hatch in spring; single generation per year with aquatic nymph stage lasting 2–3 months.
Behaviour
Males perch prominently on vegetation and are highly territorial, defending patches against rival males. Mating occurs in tandem position with pairs remaining coupled for several hours. This species is one of the few damselflies that oviposit out of water, inserting eggs into plant tissue above the waterline.
Did You Know?
  • •The Emerald Damselfly gets its name from the metallic green colouration of mature males, which becomes increasingly brilliant with age
  • •Unlike most damselflies, females lay eggs directly into plant stems above water, a behaviour called endophytic oviposition, which provides protection from aquatic predators
  • •Males exhibit a distinctive 'pruinescence'—a waxy blue-grey coating develops on older males, making them appear silvery
  • •This species is one of the earliest damselflies to emerge in spring and can be found well into autumn, making it one of the longest-flying damselfly species in the UK
  • •The nymphs are fully aquatic and are fierce predators of mosquito larvae and other small aquatic invertebrates, making them valuable for natural pest control

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