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Field Guide
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Common Darter

Sympetrum striolatum

Not yet photographed by the community

Most common late-season dragonfly; males vivid red.

Species Profile

Green List; common and widespread with stable populations
Lifespan
3–4 months as adults; full lifecycle from egg to adult approximately 2 months depending on water temperature
Size & Weight
28–29 mm body length; wingspan 36–42 mm
Habitat
Shallow, nutrient-rich ponds, ditches, marshes, and slow-moving water bodies with emergent vegetation.
UK Distribution
Widespread throughout England, Wales, and southern Scotland; absent from northern Scotland. Resident species with populations boosted by continental immigrants in late summer.
Diet
Aerial insectivore, feeding on small flying insects including midges, gnats, small flies, and mosquitoes.
Prey
Small flying insects such as Diptera (flies and midges), small mayflies, and small moths
Predators
Robber flies, larger dragonflies, birds including reed warblers and hobbies, and spiders
Mating Season
July to October
Breeding
Females lay eggs in tandem with males, depositing 300–600 eggs directly into water or mud. Nymphs develop through multiple instars over 6–8 weeks in warm conditions; one generation per year in the UK, occasionally overlapping broods.
Behaviour
Highly active and aggressive fliers, males are territorial and perch frequently on emergent vegetation or the water surface. They are among the earliest dragonflies to colonise new ponds and are renowned for their rapid breeding and short life cycle.
Did You Know?
  • •One of the most heat-tolerant UK dragonflies; activity increases dramatically in warm, sunny weather
  • •Males display sexual dimorphism: mature males are bright red, whilst females and juveniles are yellow-ochre with black markings
  • •Can complete their entire lifecycle in just 6–8 weeks under optimal warm conditions, allowing rapid population expansion
  • •Frequently expands northward and westward during warm summers, with continental migrants augmenting resident populations
  • •The nymphs are fierce aquatic predators, feeding on mosquito larvae and other small aquatic invertebrates

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