Dubreuillosaurus (Dunreuil’s lizard)
Dubreuillosaurus (Dunreuil's lizard)
Named By : Ronan Allain - 2005
Diet : Carnivore/Piscivore
Size : Estimated 5-9 meters long
Type of Dinosaur : Large Theropod
Type Species : D. valesdunensis (type)
Found in : France - Caen Formation
When it Lived : Late Jurassic, 169-164 million years ago
Dubreuillosaurus is one of the carnivore dinosaur genus that was discovered in the middle of the Jurassic Period. This is an megalosaurid. The fossils of it were discovered in France. The sole species that is named, Dubreuillosaurus valesdunensis, was initially identified as a species belonging to Poekilopleuron, also known as Poekilopleuron? valesdunensis. It is informally the only species in the Genus. It was later changed to Dubreuillosaurus valesdunensis after, at the end of 2005 Allain was able to conclude that the species wasn’t an element of the species genus Poekilopleuron. The original sample, MNHN 1998-13, is only rivaled in terms of the amount of preserved elements within the group by Eustreptospondylus. Dubreuillosaurus is believed to be the species that is sister to Magnosaurus. It was not exhibiting any signs of dwarfism in the insular region though the fossils were found in an isolated island.
User:IJReid, Public domain, via Wikimedia Commons
In 1994 The mayor from Conteville located in Normandy, Andre Dubreuil, observed that during the land reconstruction of the quarry owned by Pierre de Caen, dinosaur bones were discovered. He retrieved a fragment of a skull as well as ribs and reported the discovery to of the Paris Museum national d’Histoire naturelle. The first professional excavations began in 1998, after the rocks of the quarry’s surface that was deteriorating was already laid out by a bulldozer across an extensive area. It was required to remove and process numerous cubic meters of rubble over a period of years. The final result was about 2 000 bone fragments that range in size from 1 and 10 centimetres. These scraps were used to create a more complete skeleton needed to be put back together.
In 2002, as this procedure was not finished, Ronan Allain, after dedicating a thesis to it, described the novel species called Poekilopleuron: Poekilopleuron? valesdunensis. The name was a reference to the nearby battleground of the Battle of Val-es-Dunes in which William the Conqueror had defeated in 1046 his foes. The naming papers also contained the description of the skull. The question mark that followed the generic name was already indicating that the assigning to Poekilopleuron was not definitive. In the year 2005 Allain was able to conclude that this new animal wasn’t part of the Poekilopleuron species. This is why he came up with the name of genus Dubreuillosaurus in order to identify this particular species. which is a tribute to Dubreuillosaurus, which is the name of Dubreuil family. The species that is the type in the genus Poekilopleuron vallesdunensis. The combinat dubreuillosaurus is Dubreuillosaurus vallesd. The 2005 paper also contains an explanation of the postcranial Skeleton.
The Holotype, MNHN 1998-13, has been discovered within a layer of Calcaire de Caen dating from the middle Bathonian. It is an elongated skeleton that has skull. The preserved parts comprise: most of the skull, the splenial as well as the angular of the lower jaw; a model of the surangular the two cervical vertebrae and cervical ribs seven dorsals and ribs, gastralia, three sacrals 10 caudals, the chevron, an element of the scapula, a claw from hands, fragment of Thighbone, the upper portion of a shinbone partial fibula five metatarsal, and the first phalanx that forms the third toe. Given the lack of completeness of megalosaurids in general, this genus is unique because it has substantial proportions of the skeleton discovered. The most distinctive fossil of Dubreuillosaurus is unique in the amount of preserved bones only rivalled in this genus by that of Eustreptospondylus. The holotype is the subadult form of the animal.