WASHINGTON, Sept 29 — Remnants of DNA have been discovered in fossilised remains dating to six million years ago of a sea turtle closely related to today’s Kemp’s ridley and...
WASHINGTON, Sept 29 — Remnants of DNA have been discovered in fossilised remains dating to six million years ago of a sea turtle closely related to today’s Kemp’s ridley and olive ridley turtles, marking one of the rare times genetic material has been identified in such ancient fossils of a vertebrate, researchers said on Thursday.
In some of the osteocytes, the cell nuclei were preserved and reacted to a chemical solution that allowed the researchers to recognise the presence of remnants of DNA, the molecule that carries genetic information for an organism’s development and functioning, said paleontologist Edwin Cadena, lead author of the study published in the“I want to point out that we did not extract DNA, we only were able to recognise the presence of DNA traces in the nuclei,” added Cadena, of Universidad del...
Cadena said the only older vertebrate fossils than the newly described turtle to have been found with similar DNA remnants were of two dinosaurs — Tyrannosaurus, which lived about 66 million years ago, and Brachylophosaurus, which lived about 78 million years ago. Cadena said DNA remnants also have been reported in insects dating to tens of millions of years ago.
The fossil represents the oldest-known member of Lepidochelys and helps to shed light on the poorly understood evolutionary history of this genus, the researchers said. They did not identify it by species because the remains were too incomplete, Cadena said.
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