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Proisotoma admaritima is a rare littoral species of up to 1.3 mm in length. It was first described by Murphy (1953) from Millport, Great Cumbrae Island. Proisotoma admaritima is blue/black in colour, has 8+8 ocelli, 1+1 ventral manubrial setae, and a mucro with two teeth (Fig. 1). The tibiotarsus has a very prominent tenant seta (Fig. 2). Proisotoma admaritima was included in Bolger's (1986) checklist for Ireland. However, the Glenamoy specimens that I have checked were all Cryptopygus thermophilus and the records from central Ireland seem doubtful if Proisotoma admaritima is a seashore species. It should be looked for around the Scottish coast where it is likely to turn up in many more localities.
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