I cannot understand why anyone would want to plot two or more species on one map unless the sp1, sp2, AND sp1+sp2 dots were different colours, except possibly where the only aim was to show completely allopatric ranges, when the colours may be irrelevant anyway. Yes you can toggle the layers on and off, and change order, but if that is what was wanted you are doing little more than showing a series of single-species maps with more hassle than you have through the grid map link.
You can fiddle about with settings and eventually get a map like the attached, but the results are not wonderful. Maybe someone can explain where the current defaults are useful for >=2 spp., and why we have this facility but not the patently useful multispecies plot, but it seems to me that this was put in less for the benefit of users than for the entertainment of the programers.
Meanwhile, a few minor (but carefully-considered) changes to the settings for the default colours in the IMT would improve the appearance and usefulness of the IMT and save anyone who wants a (slightly kludged) multi-species display having to experiment and set colour properties every time.
M.
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