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. 2019 Jun 24;10:13. doi: 10.1186/s13227-019-0125-6

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 12 — Colonial ascidians. a Colonies of Botryllus schlosseri, showing typical rosette organization of individual blastozooids (dotted outline). Adapted from image by Géry Parent (https://commons.wikimedia.org/wiki/File:Botryllus_schlosseri_(Pallas,_1766).jpg). b Precocious development of juvenile structures in the adultative larva of some colonial species. Top: Non-adultative larva of the solitary species Molgula occidentalis. Bottom: Adultative larva of an unidentified colonial aplousobranch species, showing elaborated tail as well as fully formed siphons, branchial basket, endostyle, and differentiated body wall muscles. Both larvae stained with phalloidin conjugates (red) and DAPI (blue), and shown to the same scale (bar = 100 μm)