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. 2017 Sep 21;7:12052. doi: 10.1038/s41598-017-12324-4

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© The Author(s) 2017

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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SEM and LM images of traps, trap entrances and trapdoors of U. cornuta, U. warburgii and U. prehensilis representing the UUTT3. (A) Sagittal section through the narrow, tubular trap entrance of U. cornuta (scale bar = 50 µm). (B) Sagittal section of a trap entrance of U. warburgii (scale bar = 50 µm). Note the free door edge, the fringe of long sessile glands presumably functioning as trigger hairs and the conspicuous pad on the door. (C) Sagittal section of a trap of U. prehensilis (scale bar = 500 µm). The trap entrance is tubular. On the trapdoor, sessile glands are observable and on the threshold a cavity. (D) View on the inner trapdoor surface. No pattern of concentric constrictions is visible (scale bar = 50 µm). Abbreviations: c = cavity, de = door edge, m = mucilage, p = pad, sg = sessile glands, th = threshold.