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Tiktaalik is a transitional fossil; it is to tetrapods what Archaeopteryx is to birds, troodonts and dromaeosaurids. While it may be that neither is ancestor to any living animal, they serve as evidence that intermediates between very different types of vertebrates did once exist.
Transitional forms prior to fully developed terrestrial tetrapods such as Acanthostega, are thought to have captured prey in the water. [13] Large coronoid fangs are present in the fishes Eusthenopteron, Panderichthys, and Tiktaalik, and the early tetrapod, Ventasega. In Acanthostega, which is more derived, the large teeth are absent.
Tetrapod footprints found in Poland and reported in Nature in January 2010 were "securely dated" at 10 million years older than the oldest known elpistostegids [33] (of which Tiktaalik is an example), implying that animals like Tiktaalik, possessing features that evolved around 400 million years ago, were "late-surviving relics rather than ...
"Missing link" is a recently-discovered transitional fossil. It is often used in popular science and in the media for any new transitional form. The term originated to describe the intermediate form in the evolutionary series of anthropoid ancestors to anatomically modern humans (hominization).
The fossils suggest that Inostrancevia left its place of origin and trekked over time - maybe hundreds or thousands of years - about 7,000 miles (12,000 km) across Earth's ancient supercontinent ...
More than 260 dinosaur footprints discovered in Brazil and Cameroon provide further evidence that South America and Africa were once connected as part of a giant continent millions of years ago.
[1] [2] [3] He is the discoverer of the transitional fossil tetrapod Hynerpeton bassetti, [4] and a Devonian fish-like specimen of Sauripterus taylori with fingerlike appendages, [5] and was also part of a team of researchers that discovered the transitional fossil Tiktaalik. He received a Ph.D. from the University of Pennsylvania in 1998. [6]
The discovery site of Tiktaalik and Laccognathus embryi fossils in the Fram Formation on Ellesmere Island. The Fram Formation is an Upper Devonian ( Frasnian ) sequence of rock strata on Ellesmere Island that came into prominence in 2006 with the discovery in its rocks of examples of the transitional fossil , Tiktaalik , a sarcopterygian or ...