Intriguing New Discoveries about the Ancestors of Dinosaurs
Andrey Sennikov, employee of the KFU Stratigraphy of Oil and Gas Bearing Reservoirs Lab, is a part of the group.
Dinosaurs emerged in Triassic, a geological period of the Mesozoic era which started 252 Mya. It was then when archosaurs split into two evolutionary branches – bird-like and crocodile-like.
Teleocrater was for a long time in a systematic limbo because researchers couldn’t exactly place him on the ancient reptilians’ evolutionary tree. 82 years later, though, the situation finally shifted – new fossils were found. In particular, fragments of tibiotarsus which shed light on Teleocrater’s anatomical features – both those of bird-like archosaurs and crocodilians. It was approximately 3 meters long, with long neck and tail, and moved on four crocodile-shaped limbs – something that definitely contradicts the earlier hypotheses made by paleontologists.
Sterling Nesbitt, Assistant Professor at Virginia Tech, said that this discovery dramatically changed the current picture of early dinosaur evolution. Judith Skog, Program Director at the National Science Foundation, added that the research makes everyone rethink their ideas about dinosaur ancestry.
The now well-publicized work first appeared in Nature. Dr. Sennikov was one of the co-authors. Leading Research Association of the Paleontogical Institute of RAS has been in active cooperation with KFU as a visiting researcher for a few years now.
One of the Stratigraphy Lab’s main areas of expertise is paleoclimatology and paleobiology, the latter being Dr. Sennikov’s field of study. He shared that early archosaurs have been his primary focus for some time, “During the 1980s I discussed similarities between different Eastern European thecodonts, such as Dongusuchus, and Eastern African ones, including Teleocrater, with Dr. Alan J. Charig of the Natural History Museum. He was the first to describe Teleocrater. In 1994 I personally studied Teleocrater materials in the British Museum and was convinced that those are two very close taxons. Based on this, I pointed at this relationship in my monograph by putting Teleocrater and Dongusuchus in a separate group”.
Credit: Kazan Federal University
New Teleocrater’s anatomy analysis allowed the scientists to separate a new group of archosaurs under the name Aphanosauria. The group is placed on the evolutionary tree right after the split into birds and crocodiles at the very root of the former class.
Our interviewee added that this research showed the more complex diversity of early archosaurs than had previously been considered. Paleontologists plan a new trip to Tanzania soon to find more remains of Teleocrater and construct its full skeleton.
Yury Nurmeev
Source: http://www.ineffableisland.com/2017/06/intriguing-new-discoveries-about.html
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