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. 2019 May 1;9:6732. doi: 10.1038/s41598-019-42297-5

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© The Author(s) 2019

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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Trinchesia caerulea (Montagu, 1804). External views of living specimens and comparison with data from Thompson & Brown (1984). (A) Neotype, Ireland, Mayo, Killary Harbour, Rusheen Point (ZMMU Op-646). (B) Specimen from Wales, Pembrokeshire, Martin’s Haven (BELUM.Mn2018.1). (C) Specimen from Norway, Gulen Dive Resort (ZMMU Op-622). (D) Same specimen, ventral view. (E) Specimen from Italy. (F) Specimen from Spain, Girona, L’Estartit (ZMMU Op-648). (G) Specimen from Wales, Pembrokeshire, Skomer Is., depicted in Thompson & Brown (1984: pl 30, c). (H) Same, details of cerata. (I) Details of ceras from original description of T. caerulea in Montagu (1804), specimen from UK (Devon). (J). Details of cerata of specimen from Ireland. (K) Details of cerata of specimen from Wales. (L) Details of ceras of specimen from Spain. (M) Details of cerata of specimen from Italy. (N) Details of cerata of specimen from Norway. (O) Egg mass from Italy. (P) Details of anterior part of specimen from Wales. (Q) Details of anterior part of specimen from Italy. (R) Details of anterior part of specimen from Norway. Photographs: Bernard Picton, (a), (b), (d), (e), (j), (k), (p); Tatiana Korshunova: (c), (n), (r); Miquel Pontes: (f), (l), (q); Giulia Furfaro: (o). Reproduction of figures from Thompson & Brown (1984) with permission of Gregory Brown, original artist and copyright holder of the images.