0044012) "Stomach Contents from two Large Early Cretaceous Compsognathids (Dinosauria: Theropoda) Demonstrate Feeding on Conuciusornithids and Dromaeosaurids
2009): A bizarre Cretaceous theropod dinosaur from Patagonia and the evolution of Gondwanan dromaeosaurids
Dromaeosaurids are closely related to birds, and are most famous for possessing an enlarged sickle-claw on digit two (inside toe) of the foot.
We interpret the sickle claw of dromaeosaurids as having evolved to do the same thing: latching in, and holding on," he said.
Those commonalities might prompt paleontologists to move Rahonavis from the primitive-bird branch of the dinosaur family tree into the dromaeosaurid group, says Thomas R.
The creature, dubbed Buitreraptor gonzalezorum, belonged to a group of bipedal, meat-eating dinosaurs called dromaeosaurids, the clan of raptors that includes the darting, humansize velociraptors made famous in the 1993 film Jurassic Park'.
He and his colleagues described several distinguishing features, particularly of its jaw and feet, that enabled them to identify it as a dromaeosaurid - a name that means "running lizard".
They pointed out, however, that it was not Velociraptor's closest relative within the dromaeosaurid family.
Recently, while examining a dromaeosaurid
dinosaur in a private collection in China, Xu decided that the Archaeoraptor fossil is a chimera.
Theropod teeth with morphology usually attributed to dromaeosaurids were also collected in Andres.
Based on these characters, it is considered the presence in Andres of a representative of the dromaeosaurids that shares some conditions with Dromaeosaurus.
As one of the earliest and most complete dromaeosaurids
, Sinornithosaurus helps fill in critical information, says Wu.
The dromaeosaurid Achillobator from the Late Cretaceous of Mongolia (Hicks et al.
2007): A basal dromaeosaurid and size evolution preceding avian flight.
In the nest with the oviraptorid embryo lay skulls of juvenile dromaeosaurid
dinosaurs, which the oviraptorid parents may have brought to the nest to feed on, the researchers report.