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Why tyrannosaurid forelimbs were so short: An integrative hypothesis

100%

Padian K.

Acta Palaeontologica Polonica

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2022

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tom 67

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nr 1

2

The systematics of Late Jurassic tyrannosauroid theropods from Europe and North America

80%

Brusatte S. L., Benson R. B. J.

Acta Palaeontologica Polonica

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2013

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tom 58

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nr 1

Recent discoveries of more than ten new species of tyrannosauroid theropods are helping to understand the origin and evolu− tion of colossal body size and other characteristic features of Tyrannosaurus rex and its terminal Cretaceous relatives. Partic− ularly important has been the discovery and reinterpretation of Late Jurassic tyrannosauroids from Europe and North Amer− ica, which are intermediate in size and phylogenetic position between small basal tyrannosauroids and the largest Late Cre− taceous species. The fragmentary nature of these Jurassic specimens, however, has frustrated attempts to understand their systematics and phylogeny. A new specimen from the Late Jurassic of England was recently named as a new species (Stokesosaurus langhami) of the genus Stokesosaurus, which is known from several fragmentary fossils from North Amer− ica. We review the systematics and phylogeny of these European and North American specimens and show that there are no unequivocal synapomorphies uniting them. Furthermore, a revised phylogenetic analysis does not recover them as sister taxa. This necessitates a taxonomic revision of this material, and we name a new genus (Juratyrant) for theBritish specimen.

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Giganty pelne energii

80%

Sabath K.

Academia. Magazyn Polskiej Akademii Nauk

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2005

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nr 3

8-11

4

Giant theropod dinosaurs from Asia and North America: skulls of Tarbosaurus bataar and Tyrannosaurus rex compared

80%

Hurum J. H., Sabath K.

Acta Palaeontologica Polonica

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2003

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tom 48

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nr 2

The skull of a newly prepared Tarbosaurus bataar is described bone by bone and compared with a disarticulated skull of Tyrannosaurus rex. Both Tarbosaurus bataar and Tyrannosaurus rex skulls are deep in lateral view. In dorsal view, the skull of T. rex is extremely broad posteriorly but narrows towards the snout; in Ta. bataarthe skull is narrower (especially in its ventral part: the premaxilla, maxilla, jugal, and the quadrate complex), and the expansion of the posterior half of the skull is less abrupt. The slender snout of Ta. bataaris reminiscent of more primitive North American tyrannosaurids. The most obvious difference between T. rex and Ta. bataar is the doming of the nasal in Ta. bataar which is high between the lacrimals and is less attached to the other bones of the skull, than in most tyrannosaurids. This is because of a shift in the handling of the crushing bite in Ta. bataar. We propose a paleogeographically based division of the Tyrannosaurinae into the Asiatic forms (Tarbosaurus and possibly Alioramus) and North American forms (Daspletosaurus and Tyrannosaurus). The division is supported by differences in anatomy of the two groups: in Asiatic forms the nasal is excluded from the major series of bones participating in deflecting the impact in the upper jaw and the dentary−angular interlocking makes a more rigid lower jaw.

5

Zeby tyranozaurow

41%

Abler W. L.

Świat Nauki

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1999

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nr 11

32-33

Ograniczanie wyników

3 Acta Palaeontologica Polonica

1 Academia. Magazyn Polskiej Akademii Nauk

1 Świat Nauki

2 Sabath K.

1 Abler W. L.

1 Benson R. B. J.

1 Brusatte S. L.

1 Hurum J. H.

1 Padian K.

1 2022

1 2013

1 2005

1 2003

1 1999

Why tyrannosaurid forelimbs were so short: An integrative hypothesis

The systematics of Late Jurassic tyrannosauroid theropods from Europe and North America

Giganty pelne energii

Giant theropod dinosaurs from Asia and North America: skulls of Tarbosaurus bataar and Tyrannosaurus rex compared

Zeby tyranozaurow