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Pachydiplax longipennis
Blue Dasher
Family: Libellulidae
Species account author: Robert Cannings.
Extracted from Introducing the Dragonflies of British Columbia and the Yukon (2002)


Photograph

© Rosemary Taylor     (Photo ID #68428)

Map

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Distribution of Pachydiplax longipennis in British Columbia.
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Source: (for the static map) RBCM and BCCDC 2004 ©

Species Information


Description

The thorax has yellow and brown stripes; the base of the hindwing has an orange patch with two dark-brown streaks. Females and young males have brown eyes and a dark brown abdomen with two interrupted yellow stripes on the top. Mature males have a white face and green eyes; the abdomen is thickly coated with pale blue pruinescence, but the thorax is usually just thinly pruinose. Length: ♂ 38 mm, ♀ 36 mm.


Flight Period

B.C., early June to mid September.

Genus Description


A North American genus that contains only one species.

Biology

Family Description

The largest dragonfly family in our region – 24 species in eight genera live here and one other species in another genus is a rare visitor. They come in many sizes and colours, many with bold wing markings or coloured veins. Their eyes meet broadly on top of the head. The anal loop in the hindwing is distinctive: foot-shaped with a long toe. Most common around ponds, marshy lakeshores and sluggish streams, the adults dart about and most species spend a lot of time perched horizontally in the sun. Females lay eggs alone or in the company of guarding males. Most dip the tip of their abdomen into the water when releasing the eggs, but some will tap or splash the eggs into wet mud or moss, or simply flick them into a dry pond basin. Some larvae, like those of the emeralds, move sluggishly or squat on the bottom mud; others climb in vegetation.
Field Notes

Abundant across most of the southern half of North America, but restricted to a few areas of southern B.C. Most common on southern Vancouver Island and in the Gulf Islands. Often common at ponds and lakes with abundant vegetation in the water and along the shore. Males defend territories aggressively; both sexes defend feeding perches. They perch, with wings often cocked downward, on stems and twigs from near the ground to high in trees.

Distribution


Southern. In B.C., only in the lowlands of the south coast and at the north end of Osoyoos Lake in the southern interior.

Status Information

Origin StatusProvincial StatusBC List
(Red Blue List)
COSEWIC
NativeS3S4BlueNot Listed



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