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Hi all,

As part of my PhD research I am conducting macroinvertebrate surveys in chalk rivers in the UK. While I'm pretty good with most families of invertebrates, diptera are a weak spot for me. It doesn't help that I only have a very basic guide where the major diptera families are described with images rather than proper keys.

Basically, I only really need to know the family, but I'd be interested to learn the species too. Using my guide, I could not begin to identify this one. Sorry I don't have a scale to show the size.

All help very much appreciated.