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Did you dissect it to eliminate the other Emmelina species in the UK? Although it is almost certainly E monodactyla.
No i didn't dissect it to eliminate Emmelina argoteles (is that the only other Emmelina that occurs in the UK?). I was making an assumption based on E. monodactyla being a common species and on location of capture (a suburban Essex garden).
I rated this as "I'm as sure as i can be" and as you say it is almost certainly E. monodactyla. Perhaps to be absolutely correct i should re-title the sighting as "probable Emmelina monodactyla"
See also discussion about the two species of Emmelina here:
Entomologist and biological recorder
Lat/Lng: 51.5, 0.2
OS grid ref: TQ5882