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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 light microscopy (LM) images showing morphological trap characteristics of U. uniflora (representing the UUTT1), U. menziesii (representing the UUTT2), U. warburgii and U. cornuta (both representing the UUTT3). (A) Sagittal section of a trap of U. menziesii with the free door edge resting on the inner region of the threshold, reaching far into the trap lumen. The entrance is narrow and tubular, and covered by appendages on the outside. (B) Sagittal section of a trap of U. warburgii. (C) View on the inner door surface of U. uniflora. No concentric constrictions are visible. (D) View on the outer door surface of U. uniflora. Sessile glands in the upper part of the door as well as a pad of unknown function and teeth-like-structures are visible. (E) Detail of the inner door surface and the threshold with conspicuous teeth-like structures on the door edge as well as mucilage adhering to the teeth and the threshold. (F) LM sagittal thin-section (toluidine blue staining) of the trap entrance of U. cornuta. Perceptible are the cavity on the threshold and a thread of mucilage between the free door edge and the cavity. Scale bars A,B = 500 µm, C–F = 100 µm. Abbreviations: c = cavity, d = door, de = door edge, m = mucilage, p = pad, sg = sessile glands, t = teeth, th = threshold.