Paleontoriano

 
When prehistoric fish made their first forays onto land, what did they see? According to a study published in the online open access journal, BMC Evolutionary Biology, it's likely that creatures venturing out of the depths viewed their new environment in full colour.

Although lungfish mainly take in oxygen through their gills like most fish, they can also breathe air if water quality is poor. Lungfish were previously thought to have poor eyesight due to their small eyes, low spatial resolving power, sluggish behaviour in captivity and ability to detect prey using electroreception. N.forsteri inhabits a brightly lit, shallow freshwater habitat similar to the environment from which terrestrial evolution probably occurred. This prompted the team to investigate the complement of opsins expressed in N. forsteri, to trace photoreception's evolution in ancestral tetrapods.
The study paves the way for behavioural work with lungfish to see if they can discriminate between objects based on colour.
"The genus Neoceratodus, of which N. forsteri is the sole survivor, is found in the fossil record from the Lower Cretaceous period 135 million years ago and therefore N. forsteri lays claim to being the oldest surviving vertebrate genus," says Bailes. "The visual system of N. forsteri may represent an evolutionary design most closely reflecting that present just prior to the emergence of land vertebrates in the Devonian period."