How old is really old? They can still emerge from very dark & hard pupal cases from overwintering moths, I have a couple here waiting ... drop it into some water, preferably cool from kettle, for a short soak!
Your pic is rather dark, can you turn it over & take another using ruler for reference!
2013 photos & vids here
eff37 on Flickr
Hazel in the Gironde estuary, France
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