vburton's picture

Fly eat fly

Observed: 20th July 2008 By: vburton
Amateur Entomologists' SocietyBritish Mycological SocietyS159 Neighbourhood Nature - course complete
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Watched this fly eating it's lunch on a post in my garden until just an shell was left behind. I often see this species in my garden in the summer and would like to know what family it is in.

Species interactions

No interactions present.


Martin Harvey's picture


The larger fly is a muscid, and I think probably in genus Coenosia - it looks very like Coenosia tigrina, but I don't know muscids well enough to be able to confirm that. Not all muscids are predatory, but the Coenosia group are well-known for preying on flies and other insects. There are some photos for comparison at:

Its unfortunate victim looks like a fly in family Lauxaniidae, possibly in genus Sapromyza. These have larvae that develop in fungi or decaying organic matter.

Entomologist and biological recorder

vburton's picture

Predatory muscids

I had no idea there were predatory muscid species! I will never look at humble houseflies in the same way again.