Description

Very similar to the more common Blue-tailed Damselfly.

Male: mostly black with a small blue patch at the end of the abdomen.

Female: mostly black and green-brown on the underside. Immature females bright orange.

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Species GroupDamselflies
Scientific NameIschnura pumilio
Status & Distribution

Listed as Endangered in A review of the Red List status of the Odonata of Great BritainĀ 2026.

In England, its range stretches as far north as Liverpool; it is scarce across most of its English range apart from in Cornwall and the New Forest National Park. It is scarce in North and Mid Wales, with most breeding colonies located in the South. The species is absent from Scotland.

Habitat

Usually found in shallow wetland sites such as bog pools or slow flowing water, fed by seepages and flushes.

It appears to prefer early successional habitats with minimal vegetation, although some emergent plants are required at breeding sites.

A common feature of most sites is a degree of habitat disturbance, which maintains bare substrate, and the openness of the vegetation.

Flight PeriodScarce Blue-tailed Damselfly
Adult Identification
  • Length: 26-31mm
  • Two-toned pterostigma (wing spots).
  • Male: mostly black with a small blue patch on segments 8 and 9 (at the end of the abdomen) which contains two small black markings. Narrow antehumeral stripes on the back of the thorax.
  • Female: mostly black with green-brown colouration underneath.
  • Immature female: bright orange (aurantiaca phase).

 

Larval Information

No spotting on the back of the head.

Caudal lamellae have no markings.

No dark banding on the legs (distinguishes it from Blue-tailed Damselfly).

Threats
  • Alterations of hydrology, such as drainage that diverts water away from existing seepages and flushes.
  • Habitat loss and fragmentation.
  • Reworking or restoration of quarry sites leading to the loss or drying out of seepages, streams and pools.
  • Cessation of quarry working leading to the loss of pumped water in artificial channels.
  • Unmanaged sites succumb to plant succession and encroachment.
Management

Scarce Blue-tailed Damselfly Management Profile

Similar Species

Blue-tailed Damselfly

  • Both male and female have a coloured abdomen spot which is higher up on segment 8.

Red-eyed Damselfly

  • Fully coloured pterostigma (wing spots).
  • Male: Red eyes and no antehumeral stripes.
  • Female: Antehumeral stripes on the back of the thorax and Coenagrion spur on the side of the thorax.

Small Red-eyed Damselfly

  • Fully coloured pterostigma (wing spots).
  • Male: Red eyes. Broken antehumeral stripes on the thorax. Black “X” marking on the end of the abdomen.
  • Female: Blue colouration underneath. Antehumeral stripes on the back of the thorax and Coenagrion spur on the side of the thorax.