Thousands of feathered dinosaurs have been discovered, with most belonging to the theropod
branch of the family tree.
Chilesaurus is the first herbivorous theropod
, a lineage that includes mainly predatory dinosaurs, from the southern hemisphere.
Yet the research team believed Chilesaurus to represent a new type of theropod
-- "an evolutionary jigsaw puzzle that will generate debate among palaeontologists," according to Novas.
Therizinosaurs, lived about 70 million years ago, and had huge, round guts; stumpy legs; a long neck; and a turtlelike head and beak, and were herbivores despite being members of the carnivorous group known as theropods
TEHRAN (FNA)- Birds originated from a group of small, meat-eating theropod
dinosaurs called maniraptorans sometime around 150 million years ago.
The last few decades have seen increasing amounts of evidence from comparisons of bird and dinosaur skeletons to support this view--including the discovery of wishbones in a wide range of theropods
, such as Tyrannosaurus rex.
Linhenykus lived alongside closely related and similarly sized theropod
The feathered theropods
of the Jehol Biota are among the best studied carnivorous dinosaurs in the world, but they all represent small-bodied theropods
(most are smaller than an average-sized man).
Unlike other feathered dinosaurs, however, this species was not a theropod
Research intensified, and the resulting findings began painting a picture of the Denali of old: theropods
, bipedal meat-eaters that range from the size of a chicken to a towering Tyrannosaurus rex; hadrosaurs, duck-billed vegetarians from the ornithod group; and prehistoric wading birds that resembled modern-day members of the sandpiper family.
The creature belonged to a sub-group of the theropods
, the dinosaur family thought to have given rise to modern birds
The size of the prints is comparable to those of footprints attributed to large theropods
at other Glen Rose tracksites (Farlow 1987; 2001; Pittman 1 989).