Unlike most fish, Tiktaalik exhibited distinct differences in its axial skeleton, particularly in the region connecting the ribs to the pelvis.

1. Tiktaalik Fossil Unveils Evolutionary Step
Towards Walking
Source-en.wikipedia
Discoveries in Evolutionary Biology
A recent study led by researchers at the University of Barcelona sheds light on a crucial step in
the evolution of walking through the examination of the Tiktaalik fossil. This 375-million-year-
old specimen, one of the closest relatives to limbed vertebrates, has provided valuable insights
into the transition from fins to legs in vertebrate evolution. By reconstructing the skeleton of
Tiktaalik, scientists have uncovered evidence suggesting that changes in the axial skeleton
preceded the development of limbs, setting the stage for terrestrial locomotion.
Role of Axial Skeleton in Evolution
Unlike most fish, Tiktaalik exhibited distinct differences in its axial skeleton, particularly in the
region connecting the ribs to the pelvis. Through microcomputed tomography (micro-CT) scans,
previously hidden anatomical features were revealed, indicating a novel arrangement where the
ribs likely attached to the pelvis. This structural innovation is believed to have played a crucial
role in supporting the body and facilitating the eventual evolution of walking in vertebrates.
Implications for Understanding Evolutionary Transitions
The findings from this study offer valuable insights into the evolutionary transition from aquatic
to terrestrial life. By elucidating the anatomical adaptations present in Tiktaalik, researchers have
gained a deeper understanding of the mechanisms underlying the emergence of walking in

2. vertebrates. Furthermore, the discovery underscores the importance of studying transitional
fossils like Tiktaalik in unravelling the mysteries of evolutionary history and the diverse forms of
life that have inhabited our planet over millions of years.
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