A new specimen of Suzhousaurus megatherioides (Dinosauria: Therizinosauroidea) from the Early Cretaceous of northwestern China

2008 ◽  
Vol 45 (7) ◽  
pp. 769-779 ◽  
Author(s):  
Da-qing Li ◽  
Hai-lu You ◽  
Jian-ping Zhang
Keyword(s):  
Early Cretaceous ◽  
Late Cretaceous ◽  
Lower Cretaceous ◽  
Inner Mongolia ◽  
Anterior Margin ◽  
Cladistic Analysis ◽  
Gansu Province ◽  
Northwestern China ◽  
Postcranial Skeleton ◽  
Left Half

A new specimen of a therizinosauroid dinosaur recovered from the Lower Cretaceous Xinminpu Group in the Yujingzi Basin of the Jiuquan area, Gansu Province, northwestern China, consists of a partial postcranial skeleton, including a well-preserved left half of the pelvic girdle. It is referred to Suzhousaurus megatherioides Li et al., 2007 based on the autapomorphic anterior concavity of its pubic shaft and is the second known specimen of this taxon. Comparisons of the structure of therizinosauroid pelvic girdles show that the pelvis of Suzhousaurus possesses several unique features, including a laterally deflected, thin, and flat preacetabular process of the ilium, a smoothly curved anterodorsal margin of the preacetabular process of the ilium, and a concave anterior margin of the pubic shaft. Cladistic analysis confirms that Suzhousaurus is more derived than the Early Cretaceous therizinosauroids Falcarius and Beipiaosaurus , less derived than Late Cretaceous forms, and likely closely related to Alxasaurus from the Early Cretaceous of Inner Mongolia, China.

A second enantiornithean (Aves: Ornithothoraces) wing from the Early Cretaceous Xiagou Formation near Changma, Gansu Province, People's Republic of China

2006 ◽  
Vol 43 (5) ◽  
pp. 547-554 ◽  
Author(s):  
Jerald D Harris ◽  
Matthew C Lamanna ◽  
Hai-lu You ◽  
Shu-an Ji ◽  
Qiang Ji
Keyword(s):  
Central Asia ◽  
Early Cretaceous ◽  
Lower Cretaceous ◽  
Gansu Province ◽  
Northwestern China ◽  
People's Republic Of China ◽  
Republic Of China ◽  
New Name ◽  
New Information ◽  
Left Humerus

A new specimen of an enantiornithean bird from the Lower Cretaceous Xiagou Formation of Gansu Province, northwestern China, consists of an articulated distal left humerus, ulna, radius, carpus, and manus. The specimen may represent a primitive enantiornithean because it lacks a longitudinal sulcus on the radius, has incompletely fused alular and major metacarpals, and possibly retains a remnant of a second phalanx on the minor digit. It differs from all other known enantiornitheans, and exhibits possible autapomorphies, including peculiar, flat humeral epicondyles, a pair of eminences on the distal minor metacarpal, and an enormous flexor tuberculum on the alular ungual. The specimen probably pertains to the same taxon as a previously described enantiornithean arm from Changma; the incompleteness of the taxon precludes erecting a new name, but it provides new information concerning enantiornithean diversity in the Early Cretaceous of central Asia.

scholarly journals Previously Unrecognized Ornithuromorph Bird Diversity in the Early Cretaceous Changma Basin, Gansu Province, Northwestern China

PLoS ONE ◽  
2013 ◽  
Vol 8 (10) ◽  
pp. e77693 ◽  
Author(s):  
Ya-Ming Wang ◽  
Jingmai K. O'Connor ◽  
Da-Qing Li ◽  
Hai-Lu You
Keyword(s):  
Early Cretaceous ◽  
Gansu Province ◽  
Northwestern China ◽  
Bird Diversity

A new basal hadrosauriform dinosaur (Ornithischia: Iguanodontia) from the Early Cretaceous of northwestern China

2009 ◽  
Vol 46 (12) ◽  
pp. 949-957 ◽  
Author(s):  
Hai-Lu You ◽  
Da-Qing Li
Keyword(s):  
Phylogenetic Analysis ◽  
North America ◽  
Early Cretaceous ◽  
Gansu Province ◽  
Northwestern China ◽  
Occipital Condyle ◽  
Close Relative ◽  
Asian Origin ◽  
Posterior Portion ◽  
Early Late

A new hadrosauriform dinosaur, Jintasaurus meniscus gen. et sp. nov., is reported from the Lower Cretaceous Xinminpu Group of the Yujingzi Basin, Jiuquan area, Gansu Province, northwestern China. It is represented by an articulated posterior portion of the skull and is unique in having an extremely long, pendant and crescentic paroccipital process with its ventral tip projecting far beyond the ventral level of the occipital condyle. Phylogenetic analysis recovers Jintasaurus as the sister-taxon to Hadrosauroidea, more derived than other Early Cretaceous hadrosauriforms and Protohadros from the early Late Cretaceous of North America. This discovery adds one more close relative to Hadrosauroidea in Asia and supports an Asian origin for this group.

A Lower Cretaceous enantiornithine bird from the Ordos Basin of Inner Mongolia, People's Republic of China

1993 ◽  
Vol 30 (10) ◽  
pp. 2177-2179 ◽  
Author(s):  
Zhi-Ming Dong
Keyword(s):  
Early Cretaceous ◽  
Lower Cretaceous ◽  
Inner Mongolia ◽  
Ordos Basin ◽  
People’S Republic Of China ◽  
People's Republic Of China ◽  
Republic Of China ◽  
The Ordos Basin

The discovery of an Early Cretaceous bird from the Ordos Basin of Inner Mongolia (People's Republic of China) is reported. The specimen, collected by the Dinosaur Project (China – Canada – Alberta – Ex Terra) Expedition of 1990, includes scapulocoracoids, humeri, radii, ulnae and metacarpals. It is referred to the Enantiornithes.

A new, remarkably preserved, enantiornithine bird from the Upper Cretaceous Qiupa Formation of Henan (central China) and convergent evolution between enantiornithines and modern birds

2021 ◽  
pp. 1-8
Author(s):  
Li Xu ◽  
Eric Buffetaut ◽  
Jingmai O’Connor ◽  
Xingliao Zhang ◽  
Songhai Jia ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Late Cretaceous ◽  
Convergent Evolution ◽  
Upper Cretaceous ◽  
Henan Province ◽  
Central China ◽  
Postcranial Skeleton ◽  
Cretaceous Period ◽  
New Evidence ◽  
Partial Skeleton

Abstract A new enantiornithine bird is described on the basis of a well preserved partial skeleton from the Upper Cretaceous Qiupa Formation of Henan Province (central China). It provides new evidence about the osteology of Late Cretaceous enantiornithines, which are mainly known from isolated bones; in contrast, Early Cretaceous forms are often represented by complete skeletons. While the postcranial skeleton shows the usual distinctive characters of enantiornithines, the skull displays several features, including confluence of the antorbital fenestra and the orbit and loss of the postorbital, evolved convergently with modern birds. Although some enantiornithines retained primitive cranial morphologies into the latest Cretaceous Period, at least one lineage evolved cranial modifications that parallel those in modern birds.

A new lizard skull from the Purbeck Limestone Group (Lower Cretaceous) of England

2012 ◽  
Vol 183 (6) ◽  
pp. 517-524 ◽  
Author(s):  
Susan E. Evans ◽  
Marc E. H. Jones ◽  
Ryoko Matsumoto
Keyword(s):  
Early Cretaceous ◽  
Lower Cretaceous ◽  
Late Jurassic ◽  
New Genus ◽  
Cladistic Analysis ◽  
Geological Survey ◽  
New Genus And Species ◽  
British Geological Survey ◽  
Maxillary Morphology

Abstract The Purbeck Limestone Group of England has yielded a rich assemblage of Late Jurassic to Early Cretaceous (Berriasian) vertebrate fossils, including one of the most diverse Early Cretaceous lizard assemblages on record. Here we describe the first articulated lizard skull from Purbeck. The specimen was rediscovered in the collections of the British Geological Survey, having been excavated at least a century ago. Although originally assigned to the Purbeck genus Paramacellodus, with which it shares maxillary and some dental characters, the new Purbeck skull differs from other Purbeck genera, including Paramacellodus, in frontal, pterygoid and maxillary morphology. It is here assigned to a new genus and species. Cladistic analysis groups it with Lacertoidea, unlike Paramacellodus, Becklesius and Parasaurillus which group with scincids and cordyliforms.

A new fossil bird from the Early Cretaceous of Gansu Province, northwestern China

2005 ◽  
Vol 17 (1-4) ◽  
pp. 7-14 ◽  
Author(s):  
You Hailu ◽  
Jingmai O'Connor ◽  
Luis M. Chiappe ◽  
Ji Qiang
Keyword(s):  
Early Cretaceous ◽  
Gansu Province ◽  
Northwestern China ◽  
Fossil Bird

The phylogenetic position of the Tyrannosauridae: implications for theropod systematics

1994 ◽  
Vol 68 (5) ◽  
pp. 1100-1117 ◽  
Author(s):  
Thomas R. Holtz
Keyword(s):  
Early Cretaceous ◽  
Late Cretaceous ◽  
Adaptive Radiation ◽  
Late Jurassic ◽  
Cladistic Analysis ◽  
Sister Group ◽  
The Other ◽  
Phylogenetic Position ◽  
African Form ◽  
Large Predators

Tyrannosaurids are a well-supported clade of very large predatory dinosaurs of Late Cretaceous Asiamerica. Traditional dinosaurian systematics place these animals within the infraorder Carnosauria with the other large theropods (allosaurids, megalosaurids). A new cladistic analysis indicates that the tyrannosaurs were in fact derived members of the Coelurosauria, a group of otherwise small theropods. Despite certain gross cranial similarities with the large predators of the Jurassic and Early Cretaceous, the Late Cretaceous tyrannosaurids are shown to be the sister group to ornithomimids and troodontids, which share a derived condition of the metatarsus. This clade is found to be nested within Maniraptora, which is a more inclusive taxon than previously recognized. The atrophied carpal structure found in tyrannosaurids and ornithomimids is derived from a maniraptoran condition with a large semilunate carpal, rather than from the plesiomorphic theropod morphology.The taxa “Carnosauria” and “Deinonychosauria” (Dromaeosauridae plus Troodontidae) are shown to be polyphyletic, and the Late Jurassic African form Elaphrosaurus is found to be the sister taxon to Abelisauridae rather than a primitive ornithomimosaur. Purported allosaurid-tyrannosaurid synapomorphies are seen to be largely size-related, present in the larger members of both clades, but absent in smaller members of the Tyrannosauridae. The remaining giant tetanurine theropods (Megalosaurus and Torvosaurus) were found to be progressively distant outgroups to an allosaurid-coelurosaur clade. The inclusion of the Tyrannosauridae within Maniraptora suggests a major adaptive radiation of coelurosaurs within Cretaceous Asiamerica comparable to contemporaneous radiations in various herbivorous dinosaurian clades.

The early evolution of the Tyrannosauridae in Asia

1999 ◽  
Vol 73 (6) ◽  
pp. 1176-1178 ◽  
Author(s):  
M. Manabe
Keyword(s):  
Body Size ◽  
North America ◽  
Early Cretaceous ◽  
Late Cretaceous ◽  
Lower Cretaceous ◽  
Early Evolution ◽  
Land Bridge ◽  
Early Late

An isolated premaxillary tooth of a tyrannosaurid from the Lower Cretaceous section of the Tetori Group, Central Honshu, Japan, complements Siamotyrannus, which is based upon an incomplete postcranium for existence of tyrannosaurids in the Early Cretaceous of Asia. The occurrence of a tyrannosaurid tooth in the Japanese early Early Cretaceous further supports the possibility that tyrannosaurids originated during the Early Cretaceous in Asia and migrated to North America when the two continents were connected via a land bridge during the early Late Cretaceous. Thickening of the premaxillary teeth might have predated the increase in body size in tyrannosaurid evolution.

Rare bryozoans from the Gault Clay Formation (Lower Cretaceous, upper Albian) of Kent, England

2020 ◽  
Vol 296 (1) ◽  
pp. 201-209
Author(s):  
Paul D. Taylor
Keyword(s):  
Early Cretaceous ◽  
Late Cretaceous ◽  
Lower Cretaceous ◽  
Spiral Pattern ◽  
Southern England ◽  
Vertical Walls ◽  
Clay Formation ◽  
First Time

Relatively few bryozoans have been recorded to date from the Gault Clay Formation of southern England, yet the Albian (late Early Cretaceous) age of this unit makes it potentially of importance in understanding the roots of the major radiations of cheilostome and cyclostome bryozoans during the Late Cretaceous. Two bryozoan genera are here described for the first time from the Gault Clay on the basis of single specimens from the upper part of this unit at Paddlesworth (Kent), recently discovered in the collection of the late Joe Collins. A colony of the cheilostome Wawalia crenulata that preserves the putative ancestrula reveals two novel features: a spiral pattern of early budding and the presence of pyrite-filled lacunae in the thick vertical walls of the zooids. The second bryozoan is a branch fragment of the erect eleid cyclostome genus Biforicula. Representing the oldest record of this genus, it is described as Biforicula collinsi sp. nov.

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