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. 2017 Nov 14;8:1486. doi: 10.1038/s41467-017-01663-5

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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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Fig. 4 — Gene movement onto and off the Z chromosome. a Lenient classification (4132 genes classified). b Stringent classification (3189 genes classified). The phylogenetic tree is adapted from Regier et al.⁵¹. Red circles show the number of genes present on the ancestral Z chromosome. Arrows indicate the number of genes that move onto (up red arrows) or off (down blue arrows) the Z chromosome in each lineage after the split with T. sylvina. The top row indicates the total number of genes classified as Z-linked (Z) or autosomal (A) in each species