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. 2017 Jul 20;7:5948. doi: 10.1038/s41598-017-06183-2

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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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Tubefeet spicules of Tripneustes species. (A,D,E,H) Tripneustes kermadecensis n. sp. (Meyer Islands, New Zealand; paratype MA 121530.10); (B,F,I) Tripneustes gratilla gratilla (Philippines; CAS 187193); (C,G,J) Tripneustes gratilla elatensis (Aquaba, Jordan; NHMW NHMW-EV 20454). Top row: terminal disc; middle row: spicules from distal half of tube foot; Bottom row: spicules from base of tube foot. All images are backscatter electron images. 100 µm scale bar valid for images A to C; 50 µm scale bar for imaged (D) through (J).