FIGURE 1. Schematic drawings of Pseudourostyla pelotensis sp. nov. a. Living specimen in ventral view; b. Scheme of living specimen showing the contractile vacuoles and their aspect during pulsation; c. Extrusomes aligned close to the pelicle, as seen in specimens from protargol slides; d. Ventral region of protargol­impregnated specimen; e. Bow­shaped structure associated with the undulating membranes. Arrow marks new adoral membranelles in formation. aC — anterior corona; aCV — anterior contractile vacuole; AZM — adoral zone of membranelles; BC — buccal cirrus; BS — bow­like structure; eM — endoral membrane; FTC — frontotermial cirri; LMR — left marginal cirral rows; MVR — midventral cirral row; pC — posterior corona; pCV — posterior contractile vacuole; pM — paroral membrane; RMR — right marginal cirral rows; TC — transverse cirri. Scale bars: 10 µm.