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We should trust you Laura but agreeing is actually quite difficult and might give the wrong impression. You will probably know that we need to see the rostrum and its intricacies to be certain - it could be one of three, perhaps more.
I was close to offering a lower ID, just Palaemon, but that might have defeated the object as Likely will still remain with your ID.
See my very recent one - http://www.ispotnature.org/node/821033
Lat/Lng: 50.2, -4.0
OS grid ref: SX6444