The distribution of Testacealobosea is primarily in the organic horizon. Many species are described from mosses and ground vegetation. However, as Foissner (1987) points out, most of these species are edaphic species that were sampled and transferred from the accompanying soil. None the less, there are species specific to the wet moss habitat that feed on the vegetation or prey in that environment. The feeding habit of Testacealobosea is varied, with smaller species being bacterivorous or saprotrophic, while some larger ones are saprotrophic, cytotrophic, fun-givorous and predacious on microinvertebrates, microdetritivorous or omnivorous.
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