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Plathemis lydia
Common Whitetail
Family: Libellulidae
Species account author: Robert Cannings.
Extracted from Introducing the Dragonflies of British Columbia and the Yukon (2002)

Photograph

© George Doerksen     (Photo ID #1063)

Map

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

Species Information


Description

Shows striking differences between the sexes. Male’s wings have a broad dark-brown band, and the dark stripe at the wing base is bordered with white on the hindwing; when mature, the male’s broad abdomen is covered with bright white pruinescence. Female has brown wingtips, and patches at the base and in the middle of each wing. The sides of abdominal segments on females and immature males have diagonal yellow-white spots. Length: ♂ 45mm, ♀ 41mm.


Flight Period

B.C., early May to late September.

Genus Description


Plathemis is a small genus containing two species in North America – the transcontinental P. lydia and the western P. subornata. Only the former occurs in B.C. Mature adult males have bright white pruinosity covering the abdomen and a single broad brown band on each wing. Females have different wing patterns. Like Ladona species, those of Plathemis are frequently included in the closely related genus Libellula.

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

Inhabits ponds, pools in streams, puddles and quiet corners of lakes. Prefers muddy conditions and tolerates pools trampled by livestock. Typically perches on the ground or low twigs. Males raise their bright abdomens to threaten other males. Many experts place this species in the genus Plathemis.

Distribution


Southern. Valleys of southern B.C.

Status Information

Origin StatusProvincial StatusBC List
(Red Blue List)
COSEWIC
NativeS4YellowNot Listed



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