Anax ephippiger (Burmeister, 1839)
Status in Britain and Ireland:
Overall body length 61-70mm
Hindwing length 43-48mm
Not applicable as only 1 record ever made in November
Photograph © B. Kemp
Male Vagrant Emperor
The abdomen is brown with a blue saddle on the upper side of segment 2. A black dorsal line extends down the abdomen and gets broader on segments 8-10, resulting in the appearance of paired brown spots. The eyes and thorax are brown with a yellow green lower half and 2 distinctive black bars are present on the frons. The anal appendages are broad and distinctively pointed.
Though the Emperor and Lesser Emperor may appear similar the pattern of the wing cells in Vagrant Emperor is diagnostic. In the additional photographs the diagnostic area of the wing is outlined in red showing the cells are arranged in 3 irregular rows rather than 2 regular rows as seen in the Emperor and Lesser Emperor. Remember this species has only ever been recorded once in Shropshire and the Lesser Emperor has never been recorded.
A compulsive migrant species with very rapid larval development allowing temporary bodies of water in hot climates to be used as breeding grounds (Smallshire & Swash, 2014).
No breeding populations in Shropshire.
Only 1 record of this species has ever been made in Shropshire at Muxton Marsh near Telford on 23rd November, 2013. During 2013 similar extraordinary sightings of this rare migrant species were made in a number of areas in Wales, Ireland and England, and indeed ovipositing females were observed in Devon.
Where to see in Shropshire
These rare migrants are usually found following strong southerly winds that carry these insects northwards from Africa. Migrations are more typically into southern Europe or occasionally the south coast of the UK. Occasionally individuals may be found in moth traps attracted to the light.