a simplified map edited from Elliott (2016), with the new cavefish locality of El Refugio, as well as the localities included in the morphological characterization: Pachón and Tinaja in Sierra de El Abra system b position of the 12 homologous landmarks (red) and the 15 pseudolandmarks (blue) curve for geometric morphometric analysis. Within the eye orbit the vertical line (red line), corresponds to the Orbital Diameter Height, and the horizontal line (blue line) corresponds to the Orbital Diameter Length.

 
 
  Part of: Miranda-Gamboa R, Espinasa L, Verde-Ramírez MA, Hernández-Lozano J, Lacaille JL, Espinasa M, Ornelas-García CP (2023) A new cave population of Astyanax mexicanus from Northern Sierra de El Abra, Tamaulipas, Mexico. Subterranean Biology 45: 95-117. https://doi.org/10.3897/subtbiol.45.98434