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A simple and inexpensive elutriating system for extract~ng sediment-dwelling meiofauna is described. The elutriator is constructed from the readily available Quickfit glassware range. This short note describes a simple apparatus for extracting the epipsammic, endopsammic and mesopsammic fauna from sediment cores whether composed of mud or sand, and of freshwater or marine origin. The apparatus (Fig. 1) is made of readily available Quickfit glassware (Corning Ltd, Stone, Staffordshire ST15 OKB). It has been used in quantitative studies of the meiobenthic harpacticoid copepod (Cmstacea) fauna of the Ythan estuary, Aberdeenshire (Hockin and Ollason, in press), and is based on a system devised by Goodman (1980), who studied a wide range of meiofaunal taxa; see also McIntyre's system in Uhlig et al. (1973). The sediment fauna is usually killed, fixed, and preserved in hexamine-buffered 5 % V N formalin prior to extraction. A stain, such as Rose Bengal, is commonly incorporated into the preservative to allow the smaller meiofaunal organisms to be seen more readily. The preserved sediment core is placed in the separating funnel, and water is pumped through the sediment from below, washing the fauna onto a fine square-meshed grid of 50 pm aperture. Should a live extraction be required, the elutriator can be incorporated into a system comprising a pump and a reservoir, circulating sea-water containing 60 g dm-3 dissolved magnesium chloride (a narcotising agent). The rate of water flow determines the size of particle carried to the grid: the faster the flow, the heavier the organisms that are transported. The extraction time depends primarily on the type of sediment and its detritus content (Uhlig et al., 1973). For sandy substrates few problems are encountered: cores of about 100 cm3, placed in a separating funnel of 500 cm3, can be processed in the fine silt particles onto, and through the grid, where retained particles are removed and examined for their fauna. Once the silt is removed, a higher flow rate is employed to extract the remaining fauna. The extracted organisms are washed from the grid, again using the hexamine-buffered 5 % V/V formalin, either for immediate identification and counting, or for

A Simple Elutriator for Extracting Meiofauna from Sediment Matrices