the catfish Aspidoras abaster blind fish

Two cave-dwelling populations of the catfish Aspidoras abaster with reduced eyes and pigmentation have been discovered in Goiás State, Brazil. This represents the first known discovery of a troglomorphic member of the family Callichthyidae!

Link to full paper below and image also from: Secutti, S., R.E. Reis & E. Trajano. 2011. Differentiating cave Aspidoras catfish from a karst area of Central Brazil,
upper rio Tocantins basin (Siluriformes: Callichthyidae). Neotropical Ichthyology ahead of print.