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Either name is equally acceptable. It the UK the British Dragonfly Society has adopted 'Southern Emerald Damselfly' as the official name, but 'Migrant Spreadwing' is perhaps more appropriate as an international name.
Many of the names adopted by the BDS are only appropriate for use within Britain and Ireland.
Thanks you Roy. I was unsure of the protocol, but you have made it clear. I guess that using the Dijkstra version may well be the most appropriate.
Lat/Lng: 42.551839441306, 2.8937280177778
In an old gravel pit.