Figure 1

Temporal development of the known distributions and invasions of (A) Mytilicola intestinalis and (B) Mytilicola orientalis from time of first observation and species description (i.e., 1902 for M. intestinalis and 1935 for M. orientalis) until December 2017. Locations where Mytilicola spp. presence has been recorded are indicated with red dots, showing the species distribution, invasion route and spread, as well as research effort through time. For temporal development of Mytilicola spp. invasions decade-by-decade, including species absence records, see Supplementary Figs S1 and S2. For animated temporal development of Mytilicola spp. year-by-year, see the .gifs in Online Resources 1 and 2. This figure is based on data from this study and from data acquired through our literature surveys. See Supplementary Information for reference lists.