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Histriculus (his-trick-you-lus) is a hypotrich ciliate, which can be distinguished by the distribution of the cirri - the aggregates of cilia used in locomotion - on the ventral side. There is an anterior (top of image) array of membranelles (aggregates of cilia) which are used to collect food - typically algae. Differential interference contrast. Material from Nymph Creek and Nymph Lake, thermal sites within Yellowstone National Park, photograph by Kathy Sheehan and David Patterson.