@alexb0000 This looks great thanks for making it!
This matches up with what I’ve seen as well for the current best knowledge of scelop distributions. The areas in LA and MS are currently the most problematic to me; there doesn’t seem a way to be sure of what species is actually present in those locations, though I wouldn’t jump in and knock back all the scelops in MS to genus level IDs.
One potentially interesting thought is that the phylogeographic break for many species in AR and MO is not the Mississippi itself but Crowley’s Ridge. Leache et al’s map seems to follow the ridge (though maybe this was just to avoid overplotting the range map lines so close to the Mississippi).
Also linking this similar discussion from a month or so back: https://forum.inaturalist.org/t/different-sceloporus-species-range-in-mississippi/18212/6