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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Fig. 1 (above): Furca of Proisotoma admaritima collected from Millport, Great Cumbrae Island, Scotland in September 1950 by D.H. Murphy. There are 1+1 ventral manubrial setae (*), and the mucro has two teeth. man, manubrium.

Fig. 2 (above): Foot of leg 2 of the HOLOTYPE of Proisotoma admaritima collected from Millport, Great Cumbrae Island, Scotland in September 1950 by D.H. Murphy. The tibiotarsus possesses a very prominent tenant seta with a spatulate end (*). emp, empodium.