The world's oldest known mammal has been identified using dental records – predating what scientists previously thought was the first mammal to walk the Earth by millions of years – according to new research.
The world's oldest known mammal has been identified using dental records – predating what scientists previously thought was the first mammal to walk the Earth by millions of years – according to new research., Brazilian and British researchers from the Federal University of Rio Grande do Sul, London's Natural History Museum and King’s College London confirmed that the Brasilodon quadrangularis was the earliest mammal with fossil records of the animal's teeth sets.
The Brasilodon was a tiny,"shrew-like" animal that measured almost 8 inches long. Dental records for the mammal date back more than 225 million years – meaning the Barsilodon existed at the same time as some of the oldest dinosaurs, but 25 million years after the Permian-Triassic mass extinction, according to a Natural History Museum"Dated at 225.
The Morganucodon's oldest fossils, which are isolated teeth, date back 205 million years. So, the Brasilodon is believed to be roughly 20 million years older.To date, mammalian glands have not been persevered in any recovered fossils. Scientists have to turn to "hard tissues," such as bones and teeth that fossilized,"for alternative clues," the Natural History Museum notes.
The Brasilodon was identified as a mammal because of its two sets of successive teeth. When analyzing three lower jaws of different growth stages in particular, the researchers concluded that the Brasilodon's first set of teeth were later replaced with an"adult set."
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