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A cryptic species tentatively identified as Urotricha pseudofurcata, i.e., specimens of strain CIL-2019/3 from Lake Zurich in vivo (A), after protargol staining (B,C), and in the scanning electron microscope (D). (A–C) Longitudinal optical sections. (D) Oblique posterior polar view. CC, caudal cilia; CV, contractile vacuole; EX, extrusome; MA, macronucleus; OB, oral basket; OF, oral flaps; SC, somatic cilia. Scale bars 10 μm (A) and 5 μm (B–D).
