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There are several species of beetles in Agabus and Ilybius genera of about this size and appearance and field id of many is impossible (not sure what you mean by small size, as 10mm is in the medium-size range). Agabus bipustulatus is the most common and on grounds of habitat/distribution the most likely species. Ilybius guttiger is extremely unlikely, its a lowland fen species. See the water beetles of Ireland http://waterbeetlesofireland.biodiversityireland.ie/
I was hoping you would comment on this beetle following previous discussion about water beetles on the Garron.
Having looked at illustrations in a book, I thought my beetle looked more like ilybus ater than agabus bipustulatus, so I concentrated on the info presented for Ilybus ater and similar species.
From the info presented there it seemed to suggest that Ilybus guttiger was smaller than other similar species (being less than 10mm) and it gave the habitat as "peat pools with mosses."
I felt that this possibly fitted with my insect, but to be honest I put this one up to 'break the ice' with water beetles in the hope that I would learn something.
I have one or 2 other pics which you might help me with, I intend to put a bit more effort into photographing water beetles this year.
Thanks for the link,
Lat/Lng: 55.011, -6.034
OS grid ref: NW421759