Figure 2
From: Evolution of eye development in the darkness of caves: adaptation, drift, or both?
Comparing Astyanax mexicanus surface fish and cavefish eye development and degeneration. Representative stages and events of eye development are shown for surface fish (left column) and Pachón cavefish (right column). The asterisk on 24-hpf photographs represents the ventral quadrant of the retina, which is missing in cavefish. For each line, the surface fish and the cavefish pictures are at the same scale. hpf hours post-fertilization; dpf days post-fertilization; rpe retinal pigmented epithelium; br brain.