The sampling sites for deep-sea <i>Bathymodiolus</i> mussels and their relatives used in this study.

<p>Refer to <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010363#pone-0010363-t002" target="_blank">Table 2</a> for details of the sampling sites. ○, hydrothermal vent; •, cold-water seep; ▪, wood/whale bone; ▴, shallow.