Named By: L. E. Zanno & S. D. Sampson - 2005.
Classification: Chordata, Reptilia, Dinosauria, Saurischia, Theropoda, Oviraptorosauria, Caenagnathidae.
Species: H. giganteus (type).
Size: Uncertain due to the fact that the holotype specimen is a single hand which is about 30 centimetres long. Assuming that this hand is scaled to the same approximate body proportions as other related oviraptorids, then the holotype individual of Hagryphus might be about 3 meters long.
Known locations: USA, Utah - Kaiparowits Formation.
Time period: Campanian of the Cretaceous.
Fossil representation: Single hand. Fragmentary foot bones have also been attributed to the genus.
is another one of those dinosaur genera that teases us about a prospect
of being unusually large, yet known only from partial remains, in
this case a hand. At about thirty centimetres long this hand is
larger than that known for any other oviraptosaur
with the sole current
exception of Gigantoraptor.
This in turn has led to a very rough
estimate of the genus of about three meters long for the holotype and
if this is correct then Hagryphus would be the
oviraptorid dinosaur on the North American continent. For
comparison, most known oviraptorids are under two meters in length,
though some such as Citipati
from Asia are thought to have been
comparable in size to Hagryphus. All these pale
in comparison to
the aforementioned Gigantoraptor however, which
was at least eight
meters and almost three time larger than the estimate for Hagryphus.
The Hagryphus holotype fossil was recovered from the Kaiparowits Formation in Utah. An increasing number of dinosaur genera have been discovered in this formation since the start of the twenty-first century, and these as well as many other established genera are now known. These include hadrosaurs like Parasaurolophus and Gryposaurus as well as ceratopsian dinosaurs such as Utahceratops, Kosmoceratops and Nasutoceratops. Being plant eaters and aside from possibly being territorial and protective of young, most of these dinosaurs probably would not have bothered about Hagryphus. Serious threats to Hagryphus however may have come from troodontid dinosaurs like Talos, and particularly tyrannosaurs like Teratophoneus.
- A new oviraptorosaur (Theropoda, Maniraptora) from the Late Cretaceous (Campanian) of Utah. - Journal of Vertebrate Paleontology 25(4):897-904. - L. E. Zanno & S. D. Sampson - 2005.