This species was discovered in Britain by J.M.Nelson on 15.v.1957 at Holkam Moss, Lancashire in Carex and Juncus dominated fen where he also found specimens on 23.v.1964 and 15.v.1965. These observations were published by Nelson (1965) under the name C. (Scoliaphleps) ustulata. Specimens were later examined by J.R.Vockeroth who identified them as C. (S.) hyalinipennis and true C. (S.) ustulata were subsequently found in the Scottish Borders (Nelson, 1992). These two species are readily separated from other Cordilura by their almost bare arista and well developed black marking at the wing tip, but are very closely related and, at various times in the past, have been considered as subspecies or synonyms. Nelson (1992), states that the two can be readily distinguished by their genitalia and by the hairs on the pteropleuron (bare in C. ustulata whilst C. hyalinipennis has a few, fine, erect, pale hairs - a character pointed out by Vockeroth). Wing length: ♀ 4.7 mm (1).