January 15th, 2014
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| | Tiktaalik roseae fossil makes scientists re-evaluate theory about the evolution of limbs.
The Tiktaalik was a creature that, from an evolutionary standpoint, was almost halfway between lobe-finned fish (Sarcopterygii, Coelacanths) and amphibians. Originally, the theory about the development of limbs was that the fore limbs evolved first (from lobed fins such as the ones Coelacanths have) so that fish could crawl out of the water and then the hind limbs evolved to increase efficiency on land. However, with another fossil of the Tiktaalik discovered (the creature itself was discovered in 2004), scientists have begun to theorize that all four limbs evolved simultaneously.
Read more here.
I think it's an interesting theory....
Last edited by Uchuujin; January 15th, 2014 at 04:27 AM.