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. 2022 Feb 4;12:787290. doi: 10.3389/fmicb.2021.787290

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Copyright © 2022 Frantal, Agatha, Beisser, Boenigk, Darienko, Dirren-Pitsch, Filker, Gruber, Kammerlander, Nachbaur, Scheffel, Stoeck, Qian, Weißenbacher, Pröschold and Sonntag.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Cryptic species tentatively identified as Urotricha agilis. Specimens of strain CIL-2017/24 from Lake Mondsee (A–D) and of strain CIL-2019/10 from Lake Piburg (E–H) in vivo (A,B,E–G) and after protargol staining (C,D,H). (A,B,E–G) Longitudinal optical sections. (C,D) Top view and oblique top view. (H) Lateral view. AO, adoral organelles; CC, caudal cilium; CK, circumoral kinety; CV, contractile vacuole; DK, dikinetids at anterior end of somatic kineties; EX, extrusome; FV, food vacuole; MA, macronucleus; OB, oral basket; OF, oral flaps; SC, somatic cilia; SK, somatic kineties. Scale bars 10 μm (A,B,E–G), 5 μm (C,D,H).