1. Other , inparticular soft-body organisms such as oligochaetes, gnatostomulids, and turbellarians, are dif cult to identify under the stereomicroscope and require the use of a microscope for a better visualization of the peculiar features of each taxon. Samples should be mounted on a slide to use under the microscope. For permanent slides, check the detail procedure in the Section 24.2, "Identi cation ofNematodes." For a rapid preparation of the slide, transfer the specimen into a drop of deionized water located on a slide. Cover the drop and the specimen with a cover glass. Analyze the slide using a microscope with higher magni cation (×40 or ×100 with immersion oil). This type of slide can be analyzed for a few minutes before complete evaporation of the water. Do not use large drops of water because excessive water can wash out the specimen, and it may be lost when the cover glass is applied. After analysis, the specimen can be transferred again into the sample. To ease the separation of the cover glass from the slide, add a few microdrops of water between the two surfaces using a Pasteur pipette.