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. 2020 Nov 20;10:20311. doi: 10.1038/s41598-020-76348-z

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© The Author(s) 2020

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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TEM pictures of "Candidatus Pinguicoccus supinus". (A) Endosymbiont cells (arrow) in host cytoplasm, lying underneath the cortex, aggregated in clusters; macronucleus (Ma) and some mitochondria (Mt), also in proximity or in apparent close contact with endosymbionts, are visible; (B) Closer view of “Ca. Pinguicoccus supinus” showing inner membrane (IM) and outer membrane (OM); an invagination of the inner membrane (IM) is present (arrowhead); (C) Different cell shapes of three “Ca. Pinguicoccus supinus” specimens (arrow), from rounded to ovoid; the IM is invaginated (arrowhead); (D) Endosymbiont cell with an irregular shape, with an evident nucleoid (Nu) and an invagination of the IM is present (arrowhead); (E,F) “Ca. Pinguicoccus supinus” cells showing evagination of the outer membrane (double arrowhead); (F) Endosymbiont cell in proximity to a mitochondrion; (G) “Ca. Pinguicoccus supinus” showing emphasized folding (asterisk) of membrane area; (H) Endosymbiont cells (arrow) appear to be in close contact with lipid droplets (L); (I) “Ca. Pinguicoccus supinus” (arrow) during binary fission; the division septum is well visible. IM inner membrane, L lipid droplet, Ma macronucleus, Mt mitochondrion, Nu nucleoid, OM outer membrane. Arrow: “Ca. Pinguicoccus supinus” cell; Arrowhead: evagination of the outer membrane; Asterisk: folding of membrane area; Double arrowhead: section of bacterial cell folding. Bars stand for 1 µm (A–F,H,I) and 0.5 µm (G).