Fish Paralleling Vertebrate Evolution Discovered

[Shiranu]

http://mobile.nytimes.com/2016/03/25/science/researchers-find-fish-that-walks-the-way-land-vertebrates-do.html?_r=0&referer

But now a team of researchers has found a remarkable parallel to one of evolution’s signature events. In a cave in Thailand, they’ve discovered that a blind fish walks the way land vertebrates do.

The waterfall-climbing cave fish, Cryptotora thamicola, has even evolved many of the skeletal features that our ancestors did for walking, including a full-blown pelvis.

“It’s really weird,” said John R. Hutchinson, a biologist at the Royal Veterinary College at the University of London who was not involved in the new study. “It’s a good example of how much fish diversity there’s left to be discovered.”

Drop an ordinary fish on the ground, and it will flop around helplessly: Its fins are adapted for pushing against water, not fighting gravity.

The early land vertebrates, known as tetrapods, evolved adaptations that enabled them to move efficiently over solid ground. A pelvis joined their hind limbs to their spines, for example. Their vertebrae grew flanges so that they interlocked, helping the spine hold itself stiff and straight even when being pulled down by gravity.

These adaptations led tetrapods to walk in a distinctive fashion, moving their forelegs and hind legs together in a cycle. Early tetrapods probably walked much the way salamanders do today, bending their trunk from side to side as they traveled.

All tetrapods descend from a single ancestor â€" a single lineage of fish that managed to spread on land. Some other fishes evolved vaguely similar ways of moving around.

[stromboli]

Beat me to it by like a minute. Congrats.

[Baruch]

Those fish need to get out more.