May 24, 2012 12:25
In ancient times, the fish, continues to live in the water, was characterized by the acquisition of some details of the anatomical structure peculiar to terrestrial beings.
The deposits of the Carboniferous age of Scotland about 345 million years, paleontologists discovered an eel with a very unusual structure of the spine. Information detailing the fossil fish, appeared in the journal Proceedings of the Royal Society B.
Most terrestrial animals spine, usually differentiated according to the type of vertebral structure, the following five sections: cervical, thoracic, lumbar, sacral, and tail. However, the fish is divided only into two divisions — the trunk and tail. First, scientists have assumed that the other parts of the spine developed after landfall. Now the discovery of unusual eel refutes this version.
Eel-like fish called Tarrasius problematicus, was found by paleontologist Lauren Sallai while parsing collections stored at the National Museum of Scotland in Edinburgh. Previously, researchers did not notice the special structure of the backbone of several copies of this fish. "Many of the external signs that we have come to associate with tetrapods (four-legged) actually first appeared in fish, and the anatomy Tarrasius is a case in point", — explained Sallai.