How to identify greenbottles in photos

There are a few greenbottle tachinids and one of them (Chrysosomopsis aurata) is incredibly rare so I thought it might be worth showing how to identify it from the others. It is on the wing in late summer so could be easy to confuse for commoner species:

  • Hairy eyes and strong erect bristles on the abdomen – median discals and margins present?
    • Flying in Spring with black palps; thorax and abdomen the same colour – Gymnocheta viridis
    • Flying in Summer with yellow palps; thorax greenish and abdomen blueish – Chrysosomopsis aurata
  • Bare eyes?
    • One pair of post-sutural acrostichal bristles?
      • Large, usually bluish-green fly with a bright yellow, broad face – Cynomya mortuorum
      • Small shining green fly with no dusting – Neomyia cornicina
      • Medium-sized, dull-green fly with traces of white dusting at the front of the thorax – Eudasyphora cyanella
    • Two or three pairs of post-sutural acrostichal bristles?
      • Lucilia sp.

I have deliberately left out genera like Bellardia as I think the green colour isn’t as shining and “greenbottleish” as the others. All comments appreciated – this is a first draft so probably has errors.

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