donmclean's picture

Blue Damsel Fly

Observed: 20th July 2012 By: donmcleandonmclean’s reputation in Invertebrates
Blue Damsel Fly
Description:
Identifications
Species interactions

No interactions present.

Comments

chrisbrooks's picture

ID comment

Image 2 is a male Common Blue Damselfly; however those in image 1 are a different species.

John Bratton's picture

I'm glad someone else thought

I'm glad someone else thought that. First image looks like Ischnura elegans to me.

chrisbrooks's picture

Agreed

Blue-tailed Damselflies.

RoyW's picture

Observation needs editing.

The photo of the mating pair of Blue-tailed Damselflies (Ischnura elegans) needs to be removed and reposted as a separate observation.

donmclean's picture

Damselflies

Thanks for that. What identifies this as the Blue-tailed variety? Is it the lack of blue between the upper body and the tip of the tail?

RoyW's picture

ID features.

The colour of the abdomen which is largely black above and yellow below (on the male) is one feature - the exact patterns of the markings are important for the ID of damselflies. Other difference include narrower blue stripes on top of the thorax, and 'black and white' pterostigmas (the dark spot near the tip of each wing) - these are typically squarer, and a solid black colour on Common Blue Damselflies.

The colours and patterns of the female in the pair also match would would be expected for a female Blue-tailed (of the form rufescens-obsoleta), female Common Blue Damselflies have more obvious dark markings on the upperside of the abdomen.

(The shot of a single male shows a typical Common Blue Damselfly).