Map with known localities for Vitropyrgus lillianae gen et. sp. nov. and Phreatodrobia bulla sp. nov. The Edwards-Trinity Aquifer System is shown in gray shades with the lightest shade indicating the Edwards-Trinity, the medium gray indicating the Trinity, and the darkest portion indicating the Edwards portions. Major cities are indicated with a star and name label. Inset maps indicate the region of North America and state of Texas.