Tag: crocodiles

180 Million-Year-Old Crocodile Had Dolphin-Like Features, Tells Tale Of ‘Missing Link’

The discovery of an ancient type of crocodile that lived during the Jurassic Period, at the height of the age of dinosaurs, has shed new light on the species.

The 180 million-year-old fossil, named Magyarosuchus fitosi, shows that some ancient crocodiles evolved to have dolphin-like features.

The fossil was analyzed recently and found to have abnormal vertebra in its tail fin, effectively combining two different families of crocodiles – one that had limbs for walking on the surface and a bone-like protective armor on its back and one that had tail fins and flippers to aid with swimming in the ancient seas.




This fossil provides a unique insight into how crocodiles began evolving into dolphin and killer whale-like forms more than 180 million years ago,” Dr. Mark Young, of the University of Edinburgh’s School of GeoSciences, said in a statement.

The presence of both bony armour and a tail fin highlights the remarkable diversity of Jurassic-era crocodiles.

The new finding was made after the team of paleontologists analyzed the bones, which had been kept at a museum in Budapest. The fossil was originally discovered in Hungary in the Gerecse Mountains.

With an estimated body length of 4.67–4.83 m [15 feet – 16 feet] M. fitosi is the largest known non-metriorhynchid metriorhynchoid,” the study’s abstract reads.

The abstract continues: “The combination of retaining heavy dorsal and ventral armors and having a slight hypocercal tail is unique, further highlighting the mosaic manner of marine adaptations in Metriorhynchoidea.”

In addition, the newly-discovered species had large, pointed teeth, used to grasp prey, the statement added.

The study was published on May 10, in PeerJ, a peer-reviewed scientific journal.

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This 24ft Long Crocodile That Had Razor Sharp Teeth Was A Top Land Predator In Madagascar Million Years Ago

Razanandrongobe sakalavae

A new study has finally shed light on a mysterious, jaw fragment discovered on Madagascar years ago. It is from an ancient crocodile, nearly 24-feet in length, with teeth like a Tyrannosaurus Rex.

The study, published in the journal PeerJ, highlights the creature, identified as Razanandrongobe sakalavae, as an enormous crocodile ancestor. The ancient croc likely walked on land, hunting its prey with its massive teeth and jaws.




Put together by researchers Cristiano Dal Sasso , Giovanni Pasini, Guillaume Fleury and Simone Maganuco , the study notes that the teeth are “remarkably large, even larger than the largest denticles in large-bodied theropods.

The longest tooth found was 15 cm (5.9 inches) in length. By comparison, the longest T. rex tooth ever found was 12 inches, though they often vary in length.

Razanandrongobe sakalavae

R. sakalavae means “giant lizard ancestor from Sakalava region.”

“Razanandrongobe sakalavae is the largest terrestrial carnivore from this Middle Jurassic terrestrial ecosystem and was perhaps one of the top predators in Madagascar at the time,” the study’s conclusion reads.

“Its jaws were extremely robust and high, but possibly short, and bore large teeth with serrated edges resembling those of theropod dinosaurs. Many features of this species strongly suggest that it fed also on hard tissue such as bone and tendon.”

Razanandrongobe sakalavae

It is the oldest and largest known “notosuchian,” a suborder of Gondwanan mesoeucrocodylian crocodylomorphs that lived during the Jurassic and Cretaceous periods. It predates other members of the species by 42 million years.

The fossils are from the mid-Jurassic period, approximately 166 million years ago. They were first found in the early 1970s, with other parts of the Razana skull found later.

The findings were made after the fossils were made available to the Muséum d’Histoire Naturelle in Toulouse, France, where they were then analyzed and reconstructed. They had been previously part of a private collection.

jaw

The skull was reconstructed using a CT scan, as well as using 3-D printers to print out missing bone fragments, using mirror images of existing fragments.

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