Brasilodon is the oldest extinct vertebrate with two successive sets of teeth.
by the Natural History Museum. The two sets of teeth come from a small ‘shrew-like’ animal that measured around 20cm in length.The dental records date from 225 million years ago , 25 million years after the Permian-Triassic mass extinction event that led to the extinction of roughly 70 percent of terrestrial vertebrate families. Researchers from the Natural History Museum in London King's College London made the discovery and the Federal University of Rio Grande do Sul in Porto Alegre.Dr.
Scientists relied on clues from fossils of hard tissues such as bones and teeth because mammalian glands have not been preserved in any fossils found. Until this discovery, the MorganucodonOn the other hand, Brasilodon is the oldest extinct vertebrate with two successive sets of teeth, including only one set of replacements, also known as a diphyodonty.
The new research pushes back the origin of diphyodonty in Brasilodon and mammals by 20 million years. Richter concluded: “This research is a collaboration between Brazilian and British scientists, who brought together their expertise on skull development, dental anatomy, physiology and histology to interpret the juvenal and adult fossils of the extinct species Brasilodon quadragularis.”
The paper Diphyodont tooth replacement of Brasilodon - a Late Triassic eucynodont that 2 challenges the time of origin of mammals is published in the Journal of Anatomy.
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