Dubreuillosaurus

Период: Юра


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Дюбрейлозавр — род хищных ящеротазовых динозавров из семейства мегалозавров. Дюбрейлозавр получил своё имя в 2002 году, после того, как первоначально его приняли за новый вид пекилоплеврона, крупного теропода, близкого к мегалозавру. Более поздние исследования показали, что он ближе к эустрептопондилу. У дюбрейлозавра короче морда, остальные отличительные признаки заключаются в незначительных различиях в строении их позвонков и лопаток. Хотя у этого динозавра не были обнаружены гребни и рога, единственный известный экземпляр дюбрейлозавра был детёнышем, а подобные выросты могли развиваться позже. Как и его родственники, дюбрейлозавр обладал короткими, но сильными трёхпалыми передними конечностями. Останки дюбрейлозавра были найдены в осадочных породах, накапливавшихся в мангровых болотах. Это позволяет предположить, что он охотился на рыб и других морских животных.

Middle Jurassic

Dubreuillosaurus is a genus of carnivorous dinosaur from the middle Jurassic Period. It is a megalosaurid theropod. Its fossils were found in France. The only named species, Dubreuillosaurus valesdunensis, was originally described as a species of Poekilopleuron, Poekilopleuron? valesdunensis, which is still formally the type species of the genus. It was later renamed Dubreuillosaurus valesdunensis when, in 2005, Allain came to the conclusion that it was not part of the genus Poekilopleuron. Its type specimen, MNHN 1998-13, is only rivalled in the number of preserved elements in this group by that of Eustreptospondylus. Dubreuillosaurus is considered to be the sister species of Magnosaurus. It did not show signs of insular dwarfism even though it was uncovered on an island.

Dubreuillosaurus was physically comparable to Eustreptospondylus. The holotype was an individual by Gregory S. Paul estimated to measure 5 metres (16 ft) long and to weigh 250 kilograms (550 lb).[4] However, this was a subadult; the adult length is uncertain, though it has been indicated as high as 9 metres (30 ft).[5]

In 2005, Allain established some distinctive traits. Dubreuillosaurus has an unusually low and long skull, with a length three times the height. In the upper corner of the front edge of the nasal branch of the maxilla, a kink is present, separating a convex curvature below from a concave curvature above. The descending branch of the postorbital has a U-shaped cross-section. The parietal bones are not visible in side view. The supratemporal fenestra has a straight inner edge. A paraquadratic fenestra is lacking. A well-developed process is present on the underside of the jugal branch of the ectopterygoid. The rear edge of the jugal branch of the ectopterygoid, in front of the infratemporal fenestra, is deeply grooved. The lower jaw has a large external mandibular fenestra. The foramen mylohyoideum is largely oriented to the front and below. The head of the thighbone is directed to the inside and below. The front underside of the thighbone has a concave surface.[3] In 2012 Matthew Carrano added one autapomorphy: on the rear of the braincase there is a notch between the basioccipital and the bone surface formed by the exoccipitals and the opisthotic.[6]

Dubreuillosaurus seemed to lack any sort of crest or horns, but the only known specimen is a juvenile, and it is possible that these structures developed in later life. Like its relatives, Dubreuillosaurus probably had short, powerful arms with three-fingered hands.[7]

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