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
    [fairly common on sunny tree trunks or fence posts]
  • Flying in Summer with yellow palps; thorax greenish and abdomen blueish – Chrysosomopsis aurata
    [extremely rare – only a few UK records]
• Bare eyes?
  • One pair of post-sutural acrostichal bristles?
    • Large, usually bluish-green fly with a bright yellow, broad face – Cynomya mortuorum
      [an unusual species but seen fairly frequently]
    • Small shining green fly with no dusting; usually some gree on the face – Neomyia cornicina
      [very commonly seen on flowers]
    • Medium-sized, dull-green fly with traces of white dusting at the front of the thorax – Eudasyphora cyanella
      [very common]
  • Two or three pairs of post-sutural acrostichal bristles?
    • Lucilia sp.
      [a few very common species, like caesar and sericata, but others are fairly rare]

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.