Monodiamesa ekmani (Diptera : Choronomidae) in Lough Neagh, Northern Ireland

The larval habitat of Monodiamesa ekmani Brundin in Lough Neagh, Northern I reland is shallow water, less than or equal to 5m depth, on a sandy substra te. Within that habitat, larval distribution is affected by the degree of d isturbance of the sediment due to wave action. Larvae are most abundant gen erally at 4m depth, where disturbance is low throughout the year. In an are a of sand bars, larvae are more abundant in the bar troughs than on the cre sts at times of high disturbance, but they are more evenly spread through t he area in the summer when disturbance is less frequent. The life cycle app ears to be of one year's duration, with emergence in May-June.