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. 2016 May 3;6:24875. doi: 10.1038/srep24875

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Copyright © 2016, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Worldwide distribution of Ciona robusta (A) and C. intestinalis (B) based on literature records. Areas where the species have been regarded as native or as non-native or cryptogenic (i.e. of undefined status) are in blue and red respectively. For each allopatric geographical region, the approximate time is given of the first report in the literature of Ciona intestinalis sensu lato (i.e. including both C. intestinalis and C. robusta before the distinction was appreciated); for the EC (sympatric region), the time shown for C. robusta is of its first documented presence as distinct from C. intestinalis; details in Supplementary Note. Map was obtained from http://www.pedagogie.ac-aix-marseille.fr/jcms/c_67064/fr/cartotheque under the permission of the creator (Daniel Dalet©Académie Aix-Marseille).