Map of seasonal killifish sampling sites in the Mid-Northeastern Caatinga ecoregion, northeastern Brazil. Light blue lines indicate hydrography. The dark gray area indicates the Jandaíra karstic formation, while the green shapes show the limits of conservation units. Stars represent type localities, triangles show new records and circles represent literature and database records. In blue Hypsolebias martinsi, yellow H. longignatus, red H. antenori, white Cynolebias microphthalmus, and pink syntopy of H. antenori and C. microphthalmus.