Dinosaurs might have gone extinct 65 million years in the past thanks to an enormous asteroid affect, however one of many final species on the planet had one thing in frequent with one among as we speak’s most fearsome creatures — sharks.

Researchers regarded on the carnivorous Majungasaurus, the apex predator of its ecosystem, and located that they regenerated their tooth between 2 and 13 occasions quicker than different carnivorous dinosaurs, rising a brand new tooth roughly each two months.

“This meant they have been sporting down on their tooth shortly, probably as a result of they have been gnawing on bones,” the examine’s lead writer, Michael D’Emic, an assistant professor of biology at Adelphi College, mentioned in an announcement. “There may be unbiased proof for this within the type of scratches and gouges that match the spacing and measurement of their tooth on a wide range of bones—bones from animals that may have been their prey.”

CT scan-generated fashions of the jaws of Majungasaurus (left), Ceratosaurus (middle) and Allosaurus (proper), with microscopic views of the inside of their tooth beneath every mannequin. Stripes operating from higher left to decrease proper in every microscopic picture are every day deposited incremental traces, which permit the period of time it took for a tooth to develop to be reconstructed. Credit score: PLOS ONE


Although their tooth have been dagger-like, Majungasaurus didn’t have sturdy tooth, just like sharks or herbivore dinosaurs, inflicting them to regenerate at such a fast charge, D’Emic added.

The researchers have been capable of uncover the findings utilizing CT scans “on intact jaws to visualise unerupted tooth rising deep contained in the bones,” in accordance with the assertion. They have been in contrast with two different species of carnivorous dinosaurs, Allosaurus and Ceratosaurus, to provide them a higher concept on tooth-growing patterns.

The fearsome Majungasaurus crenatissimus is one of the slowest growing dinosaurs of its kind on record.

The fearsome Majungasaurus crenatissimus is likely one of the slowest rising dinosaurs of its form on document.
(Krause D.W. et al. Overview of the historical past of discovery, taxonomy, phylogeny and biogeography of Majungasaurus crenatissimus from the late Cretaceous of Madagascar. 2007. Reprinted by permission of the Society of Vertebrate Paleontology)

“This venture addresses one more facet of the biology of Majungasaurus, and predatory dinosaurs extra typically,” mentioned one of many examine’s co-authors, Ohio College professor Patrick O’Connor, “heralding the subsequent part of analysis based mostly on latest discipline discoveries.”

The examine was revealed within the scientific journal PLOS ONE.


Researchers have made some outstanding discoveries on carnivorous dinosaurs in latest months, together with discovering the world’s oldest carnivorous dinosaur, referred to as Gnathovorax cabreirai, in Brazil.

The “apex predator” lived 230 million years in the past when South America was nonetheless a part of the supercontinent Pangea. Researchers found fossils of the dinosaur that have been “full and well-preserved,” together with tooth and claws that possible made the creature a “killing machine.”

In September, researchers found that the Tyrannosaurus rex, essentially the most fearsome predator to ever stroll the Earth, had a stiff cranium that allowed it to not shatter its personal bones with its chunk drive, whereas concurrently devouring its kill.