Christian Sidor
October 27, 2021
Fossil dental exams reveal how tusks first evolved
Many animals have tusks, from elephants to walruses to hyraxes. But one thing tusked animals have in common is that they’re all mammals — no known fish, reptiles or birds have them. But that was not always the case. In a study published Oct. 27 in the Proceedings of the Royal Society B, a team of paleontologists at Harvard University, the Field Museum, the University of Washington and Idaho State University traced the first tusks back to dicynodonts — ancient mammal relatives that lived before the dinosaurs.
May 21, 2021
Pandemic-era paleontology: A wayward skull, at-home fossil analyses and a first for Antarctic amphibians
Researchers at the University of Washington and its Burke Museum of Natural History & Culture have discovered the first fossil evidence of an ancient amphibian, Micropholis stowi, from Antarctica. Micropholis lived in the Early Triassic, shortly after Earth’s largest mass extinction. It was previously known only from fossils in South Africa, and its presence in Antarctica has implications for how amphibians adapted to high-latitude regions in this dynamic period of Earth’s history.
August 27, 2020
Frequently asked questions: torpor in Antarctic Lystrosaurus
This FAQ discusses evidence for a hibernation-like condition in Lystrosaurus, a mammal relative that lived in the Antarctic portion of Pangea about 250 million years ago. This discovery was enabled by high-resolution of incremental growth marks preserved in the tusks of Lystrosaurus.
Weathering the tough times: Fossil evidence of ‘hibernation-like’ state in 250-million-year-old Antarctic animal
University of Washington scientists report evidence of a hibernation-like state in Lystrosaurus, an animal that lived in Antarctica during the Early Triassic, some 250 million years ago. The fossils are the oldest evidence of a hibernation-like state in a vertebrate, and indicate that torpor — a general term for hibernation and similar states in which animals temporarily lower their metabolic rate to get through a tough season — arose in vertebrates even before mammals and dinosaurs evolved.
January 31, 2019
Iguana-sized dinosaur cousin discovered in Antarctica, shows how life at the South Pole bounced back after mass extinction
Scientists have just discovered a dinosaur relative that lived in Antarctica 250 million years ago. The iguana-sized reptile’s genus name, Antarctanax, means “Antarctic king.”
March 28, 2018
Decade of fossil collecting in Africa gives new perspective on Triassic period, emergence of dinosaurs
A University of Washington-led project spanning countries, years and institutions has attempted to reconstruct what the southern end of the world looked like during the Triassic period, 252 to 199 million years ago.
December 8, 2016
Frequently asked questions: odontoma in a gorgonopsian
Answers to frequently asked questions about a 255-year-old tumor in a ‘pre-mammal.’
Fossilized evidence of a tumor in a 255-million-year-old mammal forerunner
University of Washington paleontologists have discovered a benign tumor made up of miniature, tooth-like structures embedded in the jaw of an extinct ‘mammal-like’ gorgonopsian. Known as a compound odontoma, this type of tumor is common to mammals today. But this animal lived 255 million years ago, before mammals even existed.
August 18, 2016
Paleontologists with the UW’s Burke Museum discover major T. rex fossil
Paleontologists with the Burke Museum of Natural History and Culture and the UW have discovered a Tyrannosaurus rex, including a very complete skull. The find, which paleontologists estimate to be about 20 percent of the animal, includes vertebrae, ribs, hips and lower jaw bones.
August 13, 2015
‘Scarface,’ an ancient cousin to mammals, unearthed in Africa
A team of scientists has identified a new species of “pre-mammal” based on fossils unearthed in Zambia’s Luangwa Basin in 2009. The ancient, Dachshund-sized creature lived some 255 million years ago, in a time just before the largest mass extinction in Earth’s history. Its discoverers include Christian Sidor, professor of biology at the University of…
May 20, 2015
Burke Museum paleontologists discover the first dinosaur fossil in Washington state
Burke Museum of Natural History and Culture paleontologists have documented the first dinosaur fossil from Washington state. The fossil was collected by a Burke Museum research team along the shores of Sucia Island State Park in the San Juan Islands.
April 29, 2013
Dinosaur predecessors gain ground in wake of world’s biggest biodiversity crisis — with photo gallery
Newly discovered fossils reveal a lineage of animals thought to have led to dinosaurs taking hold in Tanzania and Zambia, many millions of years before dinosaur relatives were seen in the fossil record elsewhere on Earth.
