The world's oldest mammal has been identified using fossil dental records -- predating the previously confirmed earliest mammal by about 20 million years -- in a new discovery hailed as "very significant" by researchers.

Brasilodon quadrangularis was a small shrew-like creature, around 20 centimeters (8 inches) long, that walked the earth 225 million years ago at the same time as some of the oldest dinosaurs and sheds light on the evolution of modern mammals, according to a team of Brazilian and British scientists.

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