» For the type of leaf margin, see Leaf#Margins (edge) The ciliates are one of the most important groups of protists, common almost everywhere there's water — lakes, ponds, oceans, rivers, and soils, with many ectosymbiotic and endosymbiotic members, as well as some obligate and opportunistic parasites included. Ciliates tend to be large protozoa, a few reaching 2 mm in length, and are some of the most complex in structure. The name ciliate comes from the presence of hair-like organelles… (More on Ciliate)