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. 2018 Nov 1;8:16219. doi: 10.1038/s41598-018-34504-6

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Light (a–d) and scanning electron (e,f) micrographs of Ophirina amphinema gen. et sp. nov. Light micrographs employed differential interference (Nomarski) optics. Scanning electron micrographs were prepared differently: (e) is from ‘fast’ prep, (f) from ‘slow’ prep (see text for details). Anterior is to top of page in all panels, and dorsal is to right of page in all panels except (f). (a,b,e) Images of suspension feeder. Both anterior and posterior flagella are equal to cell length. Nucleus (n) is visible (a,b). Flagellar vanes are visible on the posterior flagellum (e). (c,d,f) Images of swimmer. Both anterior and posterior flagella are approximately twice as long as cell length. Both flagella are inserted at anterior apex; posterior flagellum runs adjacent to ventral feeding groove. Scale bars = 5 µm (a), 2 µm (e,f). Scale bar in (a) is applicable to (b–d).