A 225-million-year-old fossilized jaw joint shifts evolutionary ...
2024年9月25日 · Now, a 225-million-year-old fossilized jaw joint appears to represent the oldest example of a type of joint that has helped make mammals what they are today. This skeletal...
Brazilian fossils reveal homoplasy in the oldest mammalian jaw …
2024年9月25日 · Here we use micro-computed-tomography (μCT) scanning to analyse the jaw joint morphology of three key non-mammaliaform cynodont species and identify the oldest example of a dentary–squamosal ...
Brazilian fossils reveal early evolution of mammalian jaw and …
2024年9月25日 · Newly discovered fossils, belonging to the mammal-precursor species Brasilodon quadrangularis and Riograndia guaibensis, offer critical insights into the development of the mammalian jaw and...
Dimetrodon borealis - Wikipedia
Dimetrodon borealis, formerly known [1] as Bathygnathus borealis, is an extinct species of pelycosaur -grade synapsid that lived about 270 million years ago (Ma) in the Early Middle Permian. A partial maxilla or upper jaw bone from Prince Edward Island in Canada is the only known fossil of Bathygnathus.
A jaw-dropping discovery about early mammals - Nature
2024年9月25日 · Mammals feed using a jaw hinge formed by dentary and squamosal bones. Fossil evidence reveals that this type of joint evolved independently in an extinct species of mammalian relatives called...
Fossils document evolutionary changes of jaw joint to ... - Nature
2024年4月3日 · A new morganucodontan-like species from the Jurassic in China shows evidence of a loss of load-bearing function in the articular–quadrate jaw joint, which probably had a role in the evolution of...
Rare Jaw Fossils Discovered in Texas Shed Light on a 20-Foot-Long ...
2024年9月24日 · But last year, a private fossil hunter named Courtney Travanini made a rare find in northeastern Texas: jaw fragments from an adult G. alabamaensis, with teeth still attached. Travanini...
439M-year-old fossil is oldest jawed ancestor of sharks - Big Think
2022年10月11日 · Among thousands of specimens, they found a new species of ancestral shark that is 439 million years old — the oldest species discovered with a fully articulated jaw. The discovery provides...
The first jaws | Science - AAAS
2016年10月21日 · The Entelognathus jaw pattern posed a conundrum for evolutionary biologists. Were the first jaws complex structures made of many external dermal bones, as in Entelognathus and osteichthyans, or were the simple blade-like jaws of most placoderms the primitive condition?
Ancient jaw gives elusive Denisovans a face | Science - AAAS
2019年5月3日 · Now, almost 4 decades later, a groundbreaking new way to identify human fossils based on ancient proteins shows the jaw belonged to a Denisovan, a mysterious extinct cousin of Neanderthals. The jawbone is the first known fossil of a Denisovan outside of Siberia's Denisova Cave in Russia, and gives paleoanthropologists their first real look at ...