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. 2018 Nov 12;18:168. doi: 10.1186/s12862-018-1276-0

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© The Author(s). 2018

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. 2 — Phylogenomic bayesian tree of 169 opsin sequences with melatonin receptors as the outgroup. There are 10 A. planci opsins (bold and checkered background) which classify into 7 different groups: 4 c-opsins, 1 chaopsin, 1 r-opsin, 1 peropsin, 1 RGR opsin, 1 go-opsin, and 1 neuropsin. No bathyopsin was found in A. planci, and has yet to be identified in any starfish species. The tree was generated by using Mr. Bayes (v3.2.5) [33] 50 million generations, with the GTR + G amino acid substitution model