Latest Astyanax Stories
The blind Mexican cavefish (Astyanax mexicanus) have not only lost their sight but have adapted to perpetual darkness by also losing their pigment (albinism) and having altered sleep patterns.
Cave life is known to favor the evolution of a variety of traits, including blindness and loss of eyes, loss of pigmentation, and changes in metabolism and feeding behavior.
University of Maryland biologists have identified how changes in both behavior and genetics led to the evolution of the Mexican blind cavefish (Astyanax mexicanus) from its sighted, surface-dwelling ancestor.
Astyanax jordani is a freshwater fish of the Characin family (family Characidae) of order Characiformes, native to Mexico. It is often referred to by its local Spanish name Sardina Ciega but is more commonly called the Cave tetra. A blind cave fish, A. jordani is a recent evolution from the Mexican tetra (A. mexicanus). While it can be confused with the blind cave form of A. mexicanus, it evolved separately from the surface form, and is considered a different species. (IUCN, however,...
- A transitional zone between two communities containing the characteristic species of each.