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Is Potamopyrgus jenkinsi a possibility - ispot changed the specific name - don't know if they are the same
P. jenkinsi and antipodarum are the same. And yes, they may be that, but they just looked a little too plump and pale. I wondered if they could be one of the brackish species, but the location is too far inland I think. Or maybe Lymnaea truncatula? I can't see what shape the eye stalks are.
Good ID Mark
But it's true, they are pale compared to the ones I have to hand just now. But most Web-references are of pale ones which I suspect are empty shells.
John, I've just checked Lymnaea (Galba) truncatula. It is quite large (at 7-12mm) compared to P.antipodarum which is only 2mm in my hand just now.
So Mick can we have more info?
GBIF Records can be interrogated, individually, after accepting Term & Conditions, by zooming the Map to the specific location and clicking View Records - In viewable area.
THREE MARINE PROJECTS
Lat/Lng: 53.1914, -0.5646
OS grid ref: SK960669