Paleontologists at American universities in Cairo and elsewhere say they found the almost perfect skull of Hyaenodont Bust Don Siltos in the lower part of the Ebel Catrani Formation in Egypt.
Bust Don Siltos lived in Egypt’s lush forests around 30 million years ago during the Oligocene era. Egypt is now home to the desert.
It is also known as Pterodon syrtos, the ancient species had the weight of hyenas or leopards (27 kg).
The animal had sharp teeth and strong jaw muscles, suggesting a strong bite.
It had a highly carnivorous diet that likely preyed on primates, early hippos, early elephants, and other large mammals.
“Bust Don Siltos belongs to a species of extinct group of carnivorous mammals known as hyaenodonts,” Dr. Shoruk al Ashkar, a paleontologist at Mansora University, American University in Cairo and colleagues, said.
“Hyenodons evolved before modern carnivorous animals such as cats, dogs and hyenas.”
“After the extinction of dinosaurs, these predators with hyena-like teeth hunted in African ecosystems.”
The skull of Bust Don Siltos was excavated in the Jebel Catlany Formation in the Faium depression.
“For several days, our team excavated a densely packed layer of rock dating back about 30 million years,” said Dr. Al Ashkar.
“As we were about to wrap up, our team members found something amazing. A large set of teeth sticking out from the ground.”
“His excited cry united the team and marked the beginning of an extraordinary discovery. The almost complete skull of an ancient apex carnivorous animal – a dream for a vertebrate paleontologist.”
“Faium is one of Africa’s most important fossil regions,” added Dr. Matt Bose, fossil curator at the Duke University Museum of Natural History.
“Without it, we would know little about the origins of African ecosystems and the evolution of African mammals like elephants, primates, and hyenodon.”
“Discovering Bustodon is an important achievement in understanding the diversity and evolution of Hyaenodonts and its global distribution,” said Dr. Al-Ashqar.
“We want to continue our research to unravel the complex relationships between these ancient predators and their environments across time and the continent.”
In their study, the authors also reevaluated a group of lion-sized hyanodons discovered in the rocks of Faium over 120 years ago.
They established a new genus of hyaenodont, sekhmetops, and reanalyzed materials from 33.8 million years ago.
They demonstrated that both Bustodon and sekhmetops actually belonged to the Hyaenodont group, which originated in Africa.
“Relatives of Bustodon and sekhmetops spread across multiple waves from Africa and eventually reached Asia, Europe, India, and North America,” they said.
“18 million years ago, some relatives of these Hyaenodonts were among the largest mammalian meat eaters to walk the planet.”
“However, radical changes in Africa’s global climate and geological shifts opened the continent to modern cats, dogs, and hyena ancestors.”
“As the environment and prey changed, the specialized and carnivorous hyaenodonts became less diverse and eventually became extinct, bringing primate relatives face to face with new adversaries.”
Survey results will be published in the Journal of Vertebrate Paleontology.
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Shorouq F. al-ashqar et al. Cranial anatomy of hypercarnivore Bust Don Siltos Gen. November. (hyaenodonta, hyainailourinae) and reevaluation of Pterodon in Africa. Journal of Vertebrate Paleontology Published online on February 16th, 2025. doi:10.1080/02724634.2024.2442472
Source: www.sci.news
