Theropoda

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Theropoda

[thi′räp·əd·ə]
(paleontology)
A suborder of carnivorous bipedal saurischian reptiles which first appeared in the Upper Triassic and culminated in the uppermost Cretaceous.

Theropoda

 

a suborder of saurischian dinosaurs. The suborder embraced more than ten families, which were united in two superfamilies (or infraorders): Coelurosauria and Carnosauria. Coelurosaurs, relatively small in size, had developed anterior extremities and a rather small skull; late forms lacked teeth. Carnosaurs, giant predators with reduced anterior extremities, had a huge skull and powerful teeth.

Theropods were the principal group of terrestrial predatory vertebrates of the Mesozoic (Middle Triassic to the end of the Cretaceous). Some may have fed on social insects, such as termites and ants, or even on the fruits of trees. They walked on two legs. Remains of theropods are known from Mesozoic deposits of all continents; in the USSR, remains have been found in Kazakhstan, Middle Asia, and Transbaikalia.

REFERENCE

Osnovy paleontologii: Zemnovodnye, presmykaiushchiesia i ptitsy. Moscow, 1964.
References in periodicals archive ?
This one-of-a-kind compendium features more than 3,000 records, covers some 750 theropod species, and includes a wealth of illustrations ranging from diagrams and technical drawings to full-color reconstructions of specimens, says a review on the Princeton University Press website.
These results of the proportions of the hindlimbs of these different groups show that as the length of the femur increases, the length of the lower leg increases similarly in felines, ungulates and non-avian theropods, and significantly different than in existing and extinct cursorial birds (Table I).
The small ornithopod and theropod footprints were clearly made by very similar (if not identical) trackmakers to those preserved at Dinosaur Stampede National Monument, which is located about 100km south of this site, he said.
Using techniques like CT scans, modem paleontologists can compare the braincases of modern birds to their relatives, including theropod dinosaurs.
"There, laid out on the table, was the most beautiful little theropod dinosaur ever found in Europe.
"Just a decade ago, no one would have imagined that theropod dinosaurs, Earth's quintessential predators, would turn out to be one of the best evolutionary case studies for how animals adapt to plant-based diets," Zanno says.
Chilesaurus is the first herbivorous theropod, a lineage that includes mainly predatory dinosaurs, from the southern hemisphere."
Chilesaurus diegosuarezi had a bird-like beak with leaf-shaped teeth, evidence that it feasted on plants, but with hind leg features similar to theropod dinosaurs, the group into which it was slotted with notorious killers like T.
Using tools normally employed to study the evolution of viruses, the team looked at 1,500 body traits across 120 species of theropod and early birds.
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.
Palaeontologist John Ostrom's work in the 1970s describing the dinosaurian "raptor" Deinonychus reopened the debate with new evidence that supported a theropod ancestry for birds.
Theropods gave rise to modern birds and included famous names such as Tyrannosaurus rex and Velociraptor.