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. 2021 Feb 3;11:2946. doi: 10.1038/s41598-021-82369-z

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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General view, cell coverings and arrangement of flagellar pocket of Apiculatamorpha spiralis (a–j,l–r—clone PhF-6, k—clone PhF-5). (a–f) living cell, LM, DIC; (g,h) general cell view, SEM; (i) longitudinal section of the cell, (j) transverse section of the anterior cell end; (k) arising of the flagella from flagellar pocket; (l) scales on the cell surface; (m–o) cross sections of the flagella (n—posterior flagellum, o—anterior flagellum); (p–r) microtubular roots and flagellar pocket. af anterior flagellum, bc bacterium, bp basal plate, cp cytopharynx, cs cytostome, cv contractile vacuole, db dorsal band of the microtubules, fbl fiber layer, fl flagella, fp flagellar pocket, fv food vacuole, mt mitochondrion, n nucleus, nu nucleolus, pf posterior flagellum, p prey, pr paraflagellar rod, r rostrum, R1 microtubular root R1, R2 microtubular root R2, R3 microtubular root R3, sf spiral furrow, sc scales, sm subpellicular microtubules, tc trichocyst, tp transversal plate. Scales: (a–f) 5, (g) 2, (h) 5, (i,j) 2, (k) 0.5, (l) 0.2, (m) 0.5, (n,o) 0.2, (p–r) 0.5 μm.