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Description of Euplotes balteatusHypotrich ciliate, mostly 40-70 x 30-50 microns, 25-33 membranelles. Body shape generally oval, left convex, right straight with obliquely truncated posterior end. Dorso-ventrally flattened about 2:l. At anterior region, dorsal surface more or less deck-like and stretching forwards, covering the ventral part and distal end of the adoral zone membranelles. 3-4 conspicuous ventral ridges between buccal field and right margin; ridges among transverse cirri short but prominent. About 6-7 longitudinal dorsal ridges extending over entire length of body. Cilia of cirri and membranelles about 10-15 microns long. Cytoplasm colourless, containing many refractile globlues about 2-3 microns across, and food vacuoles with possibly flagellates or bacteria. Macronucleus inverted C-shaped. Contractile vacuole at level of transverse cirri. Crawls on the substrate, not fast and slightly jerking. Adoral zone of membranelles about 2/3 of body length, anteriorly terminating near right margin, where there is an inconspicuous spur-like projection on ventral surface. Paroral membrane small, new-moon-shaped, typically composed of "many" irregularly arranged kinetosomes; positioned beneath the buccal lip and hence generally revealed only by protargol impregnation. Considering the small size, most cirri - except marginal and caudal ones - are rather strong (bases usually considerably large, especially in small individuals). Consistently with10 frontoventral cirri arranged in normal pattern; 5 transverse cirri posterior to cytosome, among which the second one from left is in most cells conspicuously stronger than the others. 2 left marginal cirri mostly closely spaced, cirri fine, about 15 microns long. Consistently 2 fine caudal cirri near caudal margin. Dorsal ciliation usually with 2 dorso-lateral kineties on margins of both sides. On dorsal side, mostly 7 kineties extending over entire length of body, mid-dorsal rows with about 9-14 dikinetids.