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Cordulia shurtleffii
American Emerald
Family: Corduliidae
Species account author: Robert Cannings.
Extracted from Introducing the Dragonflies of British Columbia and the Yukon (2002)


© Jeremy Gatten     (Photo ID #16092)


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Distribution of Cordulia shurtleffii in British Columbia.
(Click on the map to view a larger version.)
Source: (for the static map) RBCM and BCCDC 2004 ©

Species Information


The face is dark with brilliant green eyes. The thorax is metallic green-bronze and, unlike those of many Striped Emeralds, has no pale marks on the sides. The abdomen is black after segment 4 and the male’s is widest at segment 8. Male’s appendages are forked in views from below and the side. Female’s vulvar lamina shown in figure. Length: ♂ 45mm, ♀ 46mm.

Flight Period

B.C., early May to early September; Yukon, late May to early August.

Genus Description

Remarkably similar to their close relatives, Striped Emeralds (a much larger genus). There are only two species of Common Emeralds – ours and the Downy Emerald (Cordulia aenea) in Eurasia – but as the English genus name suggests, they are widespread and common.


Family Description

Medium-sized dragonflies most often seen around lakes, boggy streams and peatlands in the mountains or in the north. Of 16 species in our region, 13 have Northern or Beringian ranges. The eyes, often brilliant green, meet broadly on top of the head. The shape of the anal loop in the hindwing is distinctive. Adults seldom perch during feeding and males frequently hover when patrolling for mates; when resting, they normally hang vertically or obliquely from vegetation. In flight, a male frequently arches its abdomen, which is often narrower at the base and tip. Larvae are usually squat and rather hairy; they sprawl in the mud and detritus in the bottom of the waters where they live.
Field Notes

The most commonly seen emerald in our region. Flies early in the season, usually well before Striped Emeralds appear, but both genera fly together later in the summer. Males patrol energetically and aggressively around forest lakes and peatlands, chasing off males of their own and other species.


Northern. Widespread in B.C. and the Yukon.

Status Information

Origin StatusProvincial StatusBC List
(Red Blue List)
NativeS5YellowNot Listed

BC Ministry of Environment: BC Species and Ecosystems Explorer--the authoritative source for conservation information in British Columbia.