Sentences with phrase «says paleobiologist»

The foliage was so dense «a human would have had to chop through it with a machete,» says paleobiologist Bill DiMichele.

Not exact matches

These findings «are very interesting,» says Zerina Johanson, a paleobiologist at the Natural History Museum in London.

A 100,000 - year - long cold spell triggered the growth of glaciers almost down to tropical latitudes, says Lauren Sallan, a paleobiologist at the University of Pennsylvania.

«People previously thought that you needed some threshold level of oxygen for evolution to work really well,» says Carl Simpson, a paleobiologist at the University of Colorado in Boulder who was not involved in the work.

One of the authors of the study, Kenshu Shimada, a paleobiologist at DePaul University, said Rhinconichthys are exceptionally rare, known previously by only one species from England.

Dragonfly - like insects with foot - long wingspans buzzed in the humid air, and chunky primitive spiders called trigonotarbids, bearing thick black - tipped fangs, sat atop trees, says Smithsonian Institution paleobiologist Bill DiMichele.

For example, the scrape marks could have been made when meat - eating predators, such as the mighty Acrocanthosaurus, scraped their powerful hind legs on the ground to make noise and warn other males — of either the same or a different species — to stay away, says Timothy Isles, a paleobiologist at the University of Portsmouth in the United Kingdom.

«Everyone would have wanted it,» paleobiologist Alan Cooper says.

«They look very different than mammals today,» says team member and paleobiologist Kenneth Angielczyk of Chicago's Field Museum,» similar to the way a T. rex doesn't look much like a goldfinch.»

«We've found that extinction threat in the modern oceans is very strongly associated with larger body size,» said Jonathan Payne, a paleobiologist at Stanford's School of Earth, Energy & Environmental Sciences.

But that shape doesn't necessarily mean that the feather's former owner could fly, says study coauthor Ricardo Pérez - de la Fuente, a paleobiologist at the Oxford University Museum of Natural History.

«He never really locked into the academic traditions of the institution,» says Brian Huber, a paleobiologist with the Smithsonian National Museum of Natural History, who worried about Small's business focus.

Pathogens that ravaged the body at its death can be entombed within the tooth's inner chamber and detected years later, says Kirsten Bos, a molecular paleobiologist at the Max Planck Institute for the Science of Human History in Jena, Germany, and an author on the study.

«Filter feeding and gigantism are associated, which is a pattern we see in different groups of animals across the tree of life,» says Gregory Edgecombe, a paleobiologist at the Natural History Museum in London, who wasn't involved in the research.

«This species is a very important intermediate, a transitional form,» says Javier Ortega - Hernández, a paleobiologist at the University of Cambridge in the United Kingdom, who wasn't involved in the research.

Ksepka's new analysis is «a solid piece of work,» says Mark Witton, a paleobiologist at the University of Portsmouth in the United Kingdom.

«I think the interpretation is overblown and not supported by the data,» says John Alroy, a paleobiologist at the University of California, Santa Barbara.

«They are not animals and they are not embryos,» says Stefan Bengtson, a paleobiologist at the Swedish Museum of Natural History in Stockholm.

«This tells us that humans have been having a massive effect on the environment for a very long time,» said S. Kathleen Lyons, a paleobiologist at the Smithsonian's National Museum of Natural History who led the new research.

«The pattern of co-occurring species remained stable through the evolution of land organisms from the earliest tetrapods through dinosaurs, flowering plants and mammals,» said Anna K. Behrensmeyer, a paleobiologist with the Smithsonian's Museum of Natural History and a co-author of the study.