Pearse and Voigt (2007) report that in their sampling using glass slides, certain general types of organisms were often found in association with placozoans, including several kinds of sessile ciliates (solitary and colonial vorticellids as well as folliculinids); spirorbid and other serpulid polychaetes; and, in smaller numbers, free-living loxosomatid kamptozoans (entoprocts). Placozoans have been observed capturing and eating ciliates in a culture dish. Wild placozoans are probably opportunistic grazers and scavengers on organic detritus and on algae and bacteria in biofilms covering a diversity of substrates. (Pearse and Voigt 2007 and references therein)
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