A Chaetostoma microps (Surface catfish) B Astroblepus pholeter (Cave catfish). Both species inhabit the same river drainage.

 
 
  Part of: Espinasa L, Robinson J, Soares D, Hoese G, Toulkeridis T, Toomey III R (2018) Troglomorphic features of Astroblepus pholeter, a cavefish from Ecuador, and possible introgressive hybridization. Subterranean Biology 27: 17-29. https://doi.org/10.3897/subtbiol.27.27098