Flatworms under a stone.
Sharing space with some earthworms (photo 2)!
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I wonder is it triangulata or triangulatus? Triangulata as above seems to be more popular- it has a much larger carousel than the other which has 3. I am assuming it is one species and not 2 seperate ones.
iSpot gives 'triangulata' automatically yet, when I Google it, it seems 'triangulatus' is more commonly used. Maybe some confusion with the synonym 'Artioposthia triangulata'.
I copied triangulatus from another observation on iSpot, one of my own. I am not sure how I got my scientific name for that obs, it was either by googling flatworm or using get recommended. Probably the former after what you said above re get recommended.
The current name is Arthurdendyus triangulata with Artioposthia triangulata a valid synonym. -us is an error.
Lat/Lng: 54.5644, -5.9311
OS grid ref: NW459259