‘Beau’
Slieve League, Co. Donegal
Pyrrhosoma nymphula
Lestes sponsa
Variable Damselfly
The Variable Damselfly can be confused with the Azure or Common blue at first sight, but if you look closely (or better still, examine
a photograph at your leisure), the ‘U’ shaped mark on the thorax is joined onto the black ‘ring’ below it (they are separate in the
Azure form), so that it looks like a Chalice, or Wine glass. They are more slender than other damselflies. Females have a green and a
blue form. Another distinguishing feature is the shape of the pronotum (a little ‘collar, between the head and thorax) which has
strongly trilobate margins. (In the Azure damselfly, this is much broader and flatter).
Common Blue Damselfly
Male Common Blues can be distinguished from other damselflies by having a single black stripe on the side of the
thorax, a black ‘Club’ shaped mark on segment 2 of the thorax, and all-blue upper surface of segments 8 and 9 of
the abdomen. Immature males can be a paler blue or lilac, colour. The females can have variable colours, either
blue, like the males, or the ‘drab’ form, which is a yellowish or pale biscuit colour. But all Common Blue females
have a little spine sticking out below segment 8 of the abdomen.
Blue-tailed Damselfly
Males are fairly easy to identify, with a metallic black body, and bright blue segment 8 on the
abdomen, with green or blue thorax. Females can have a variety or colour forms at different
stages of maturity. The image on the middle left shows the ‘rufescens’ phase eating a moth, with
reddish-pink thorax and blue tail. This ‘rufescens’ form develops into a more yellow/brown
appearance with the ‘brown ’tail’ (far left). Females can occur in a violet coloured, or greenish form
also!
Blue-tailed damselflies can be seen in flight from May to September, and are reputed to be
tolerant to some degree of pollution or brackish water. This is a beautiful species to photograph,
showing such variation in colours.
The Emerald damselfly looks larger, and sturdier
than the the Blue damselflies, however, it appears to
have a much weaker flight than the Blues. The female
Emerald damsel, pictured here, has a green body,
going into a burnished brown at the sides. It can
perch with its wings half open, unlike the Blues,
which close their wings fully at rest.
Male Emeralds damselflies have a metallic green
body, but as they mature, develop a bluish-white
colour on the thorax and first two abdominal
segments, and also on segments 8 and 9.
These damselflies emerge in late June, and can be
seen in flight up to September.
The Large Red damselfly is quite conspicuous, and
unlikely to be mistaken for anything else with its red
and black colouration, and black legs.
This image is of a female, probably the ‘intermedia’
form. There are three colour forms with varying
amounts of black on the body, and red and yellow
thorax.
Males have a predominantly red abdomen, with black
on the 7th and 8th segments. Near the tips of the
wings, there are black square shaped spots.
The only other red Damselfly is the Small Red, which is
not found in Ireland, though abundant in South West
Europe, and in parts of Southern England and Wales.
Damselflies are a beautiful Order of species within the group that also contains the Dragonflies. This
selection of photographs have been collected over the years. Damselflies are very variable, particularly in
colour, which makes identification sometimes difficult. Identification is more often based on small
features of their structure and anatomy rather than colours. Thus the Blue-tailed Damselfly doesn’t
always have a blue tail!
Azure Damselfly
This is a very common damselfly, to be seen on the wing from mid May (depending on the weather) until August.
The head, thorax and abdomen of males are black and blue, while females have more black, with a blue or green
thorax. Males have a characteristic black ‘U’ shaped mark on the second segment of the thorax. These damselflies
are usually seen flying around emergent vegetation at the edges of ponds or ditches, or feeding by sunny ditches,
hedges and woods. Beautiful to see, and photograph, though they don’t stay in one spot for long!
An exploration of wild & interesting places in Ireland and their western European/American flora and fauna…