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I have been interested in nature for most of my life but since I retired I spend as much time as I can exploring the nature reserves and wildlife hotspots of my adopted home, Dorset in southern England. Whilst out I record what I see and take snaps where I can (I am no photographer!) and that forms the basis of my Nature of Dorset website. When I find something new I like to research it and write about it in my nature notes, it is how I learn and hopefully you might find my notes helpful as well!

This website is for the people of Dorset interested in wildlife and for people from elsewhere interested in the wildlife of Dorset!

17 January, 2017

Dexiosoma caninum: a parasitic fly



There are hundreds of species of flies in this country and identifying them is a job for the experts but a small number can  be named by outright amateurs with some certainty. As always, it is a matter of not just looking at the small picture but looking at the surrounding bigger picture. However, with so many species of flies there are countless species about which we know very little.
What do we know about this species? All I can establish is that it is called Dexiosoma caninum with no common English name. The species name, caninum, obviously has something to do with dogs but the fly itself does not seem to! My field guide to the insects of Britain by Paul Brock says that this species is between 8 and 13 millimetres in length which is about half an inch which is quite big for a fly. It has long legs in relation to its body. It favours woodland and the low vegetation below the trees with a particular fondness for bracken. It can be seen from June through until September and it is believed to be a parasite of beetle larvae. Actually, that is quite a lot of information about a fly!
My photograph shows an attractively marked fly on bracken in the woodland by East Stoke fen in June. I think I can conclude from that that this is. indeed, likely to be Dexiosoma caninum.
Dexiosoma caninum: a parasitic fly