Rare Chinese fossil teeth have changed scientists' beliefs about the evolution of vertebrates. An international team of scientists has found toothed fish remains that date back 439 million years, which suggests that the ancestors of modern chondrichthyans (sharks and rays) and osteichthyans (ray- a
Volumetric reconstruction of a tooth whorl viewed from its lingual side . The specimen is just over 2 mm in length. Credit: Zhu, et al.An international team of scientists has found toothed fish remains that date back 439 million years, which suggests that the ancestors of modern chondrichthyans and osteichthyans originated far earlier than previously believed.
The discovery indicates that the well-known jawed vertebrate groups from the so-called “Age of Fishes” were already established some 20 million years earlier. For the researchers, the key to reconstructing the growth of the whorls was two specimens at an early stage of formation, easily identified by their noticeably smaller sizes and fewer teeth. A comparison with the more numerous mature whorls provided the paleontologists with a rare insight into the developmental mechanics of early vertebrate dentitions.
Brasil Últimas Notícias, Brasil Manchetes
Similar News:Você também pode ler notícias semelhantes a esta que coletamos de outras fontes de notícias.
Boy dies of rare brain-eating amoeba after visit to Lake Mead, officials sayA boy has died after exposure to a rare brain-eating parasite at Lake Mead, the popular recreation area near Las Vegas, health officials say.
Consulte Mais informação »
San Antonio family sends a rare Ford Model B to the SmithsonianThe car offers a glimpse into the life of a railroad porter, labor history and the Black middle class in an era of racial discrimination.
Consulte Mais informação »
Tom Brady Rare Autographed Rookie Card Sells For $2.4 MillionA rare, signed Tom Brady rookie card just sold for $2.4 million at auction!!
Consulte Mais informação »
College Football Picks: Pac-12 gets a rare top-10 showdownThe Pac-12 has not had a game like UCLA-Oregon in four seasons, and only two of them over the last nine. The ninth-ranked Bruins visit the No. 10 Ducks on Saturday in the first regular-season meeting of Pac-12 teams ranked…
Consulte Mais informação »
Rare 'triple-dip' La Niña, climate change to expand drought across U.S. this winterThe third straight La Niña winter in the U.S. is likely to cause drought to expand and deepen from California to the Plains, branching out across the Southeast.
Consulte Mais informação »
College Football Picks: Pac-12 gets a rare top-10 showdownThe Pac-12 has not had a game like UCLA-Oregon in four seasons, and only two of them over the last nine.
Consulte Mais informação »