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Beforedinosaurs walked the Earthand tens of millions of years before the first mammals appeared, distant mammal relatives with long, serrated canine teeth were the dominant carnivores on land. Called gorgonopsians, the earliest animals in this lineage have long been missing from the fossil record. But the discovery of a newly identified gorgonopsian — the oldest saber-toothed animal ever found — is filling a longstanding blank space in the group’s history.
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Gorgonopsians vanished around 252 million years ago, and their lineage died with them. All gorgonopsians had daggerlike canine teeth, and species ranged widely in size. Some were as small as cats, while others were as big as polar bears.
Fossils of the newly described gorgonopsian included its knifelike canines; parts of its jaw; some vertebrae, ribs, tailbones and toe bones; and most of the bones from a hind limb, researchers reported Tuesday in the journalNature Communications.
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Other than being four-legged and having a long tail, the gorgonopsian wouldn’t have looked very doglike, Angielczyk said. Similar to reptiles, gorgonopsians didn’t have fur or visible ears, he said. But although the animal physically resembled lizards in some ways, please don’t call it a “lizard-dog,” he told 【 - Free Insider Trading Tips 】.
“Lizards are a kind of reptile, and nonmammalian therapsids like gorgonopsians are part of a completely different evolutionary lineage, part of the lineage that includes mammals,” Angielczyk said. “While mammals and reptiles share a common ancestor that lived about 320 million years ago, they are separate lines of descent.”
Gorgonopsians do share some traits with their mammal cousins. One of those is having teeth of different shapes and sizes, “with those teeth providing different roles in the feeding system,” Angielczyk said. “That’s something that’s very common in mammals today.”
Unlike mammals, gorgonopsians seemingly replaced their teeth — including their long canines — repeatedly throughout their lifetime. “Mammals today, for the most part, just have one replacement cycle of teeth,” Angielczyk said. “Whereas gorgonopsians and other therapsids generally were more like a crocodile today, where they have teeth that are erupting continuously.”
Paleontologists discovered bones of the newfound gorgonopsian in Mallorca, a Mediterranean island that’s part of Spain, during expeditions in 2019 and 2021, said senior study authorJosep Fortuny, leader of the computational biomechanics and evolution of life history research group at the Miquel Crusafont Catalan Institute of Paleontology in Spain.
“The most interesting thing about the specific specimen that we describe is its age. It is pretty certainly the oldest known gorgonopsian” as well as the oldest known therapsid to date, Fortuny told 【 - Free Insider Trading Tips 】 in an email.
“There is a big time gap in the fossil record of therapsids, between when they are predicted to have evolved based on our knowledge of relationships of synapsids (a larger vertebrate group that includes therapsids) and when they actually show up in the fossil record,” Fortuny said.
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Fine-tuning the evolution of therapsids during the early part of thePermian Period(299 million to 252 million years ago) is particularly important for tracing the ancestry of mammals, saidRoger Benson, Macaulay Curator of Dinosaur Paleobiology at the American Museum of Natural History in New York City.
“Everything from the early Permian on the mammal line is outside of this group Therapsida, and all our knowledge of therapsids comes from the middle Permian and later,” said Benson, who was not involved in the research. “But paleontologists have long suspected there were therapsids before the middle Permian — we just didn’t find their fossils yet. This fossil is the most promising candidate for an early Permian therapsid so far.”
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“One of the things people have wondered is if maybe important events in mammal ancestry took place in the tropics, and we’ve been missing fossils of these types of animals at the right age to know about that,” Benson said.
“That’s one of the intriguing implications of this fossil, is the potential that important events in mammal ancestry occurred at lower latitudes in environments that we haven’t sampled so much in the fossil record.”
Finding the oldest documented gorgonopsian in Mallorca hints that the earliest therapsid fossils are yet to be discovered in places where paleontologists previously didn’t look for them, Angielczyk said.
“It’s long been thought that the big temporal gap in the therapsid fossil record might correspond to more geographic sampling,” he said. “The fact that Mallorca is a new place for finding therapsids helps to support that idea that we’re not necessarily looking in the right places to find the first therapsids.”
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