共查询到20条相似文献，搜索用时 31 毫秒
1.
Junchang JI Qiang Institute of Geology Chinese Academy of Geological Sciences Beijing 《《地质学报》英文版》2005,79(2):157-163
Based on a nearly complete skeleton with skull from the Early Cretaceous of Liaoning Province, a new ornithocheirid pterosaur: Boreopterus cuiae gen. et sp. nov. is erected. Boreopterus cuiae is different from other pterosaurs preserved with skulls known from the western Liaoning Province and its neighboring areas. Tiffs new oterosaur has more and larger teeth than those in other ornithocheirids. Its anterior nine pairs of teeth are larger than other teeth. The fourth pair of upper and lower teeth are slightly larger than the third pair. Overall, Boreopterus cuiae shows much small range of tooth size variation than Anhanguerapiscator and Coloborhynchus robustus. The new taxon shares with other ornithocherids in having a relatively large size of the third and fourth pairs of teeth. 相似文献
2.
A new pterosaur Moganopterus zhuiana gen. et sp. nov. is erected based on a complete skull with lower jaws and anterior cervical vertebrae. It is characterized by much elongated upper and lower jaws with at least 62 total, long, curved teeth with sharp tips, a well developed parietal crest extending posterodorsally, forming an angle of 15 degrees with the ventral margin of the skull, the ratio of length to width of cervical vertebrae greater than 5:1. The skull length is 750 mm, and it is the largest toothed pterosaur found so far in the world. Based on this new pterosaur, the Boreopteridae can be divided into two subgroups: Boreopterinae sub-fam. nov. and Moganopterinae sub-fam. nov., which is also confirmed by the phylogenetic analysis. 相似文献
3.
During the last two decades more than twenty phylogenetic analyses of pterosaur relationships have been published. These range from small scale studies restricted to a few species from one clade, to comprehensive analyses that include the majority of known taxa. Most of these contributions can be traced back to data sets published either by Kellner (2003) or Unwin (2003), who, in turn, incorporated data from earlier analyses by Howse and Bennett. 相似文献
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Lorna STEEL 《《地质学报》英文版》2012,86(6):1340-1355
The pterosaur collection at the Natural History Museum is of great historical importance. Most of the material is figured or cited, and several specimens are types or casts of types. Pterosaurs from UK localities are well represented, but foreign material is also present as original specimens and as high quality casts. The entire collection has been recorded in a database and curatorial improvements have been made, which has improved physical and virtual access to the collection. Although many of the specimens were collected as long ago as the early 1800s, they are still useful today. A full list of Natural History Museum pterosaur specimens is published, for the first time since 1888. 相似文献
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A new ctenochasmatoid pterosaur from the Early Cretaceous Yixian Formation of western Liaoning,China
A new ctenochasmatoid pterosaur, Gladocephaloideus jingangshanensis gen. et sp. nov. from the Yixian Formation of western Laioning Province is erected based on a complete skull and partial postcranial skeleton. It is characterized by following features: about 50 total teeth with sharp tips; small nasoantorbital opening, occupying approximately 13% of the skull length; ratio of prenarial length to skull length approximately 0.63. The diagnoses of the Ctenochasmatoidea and Gallodactylidae are amended based on the new taxon. Gladocephaloideus jingangshanensis is the first gallodactylid pterosaur found in Asia. Its discovery not only provides much more osteological information about the Gallodactylidae but also indicates that the ctenochasmatoid pterosaurs were highly diverse in the Early Cretaceous. The filamentous structures preserved near the dorsal and posterior margins of the posterior portion of the skull and around the neck indicate that it had an epidermal covering and may have been a warm-blooded animal. 相似文献
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A New Boreopterid Pterodactyloid Pterosaur from the Early Cretaceous Yixian Formation of Liaoning Province, Northeastern China 总被引：2，自引：0，他引：2
Lü Junchang 《《地质学报》英文版》2010,84(2):241-246
<正>A new boreopterid pterosaur:Zhenyuanopterus longirostris gen.et sp.nov.from the Yixian Formation of western Liaoning is erected,based on the complete skeleton with a skull and lower jaws preserved.It is characterized by:a large boreopterid pterosaur with a high number of teeth,where the anterior teeth are much larger than posterior ones;the length of the dorsal + sacral vertebrae is nearly half the length of the skull;ratio of the length of the humerus to metacarpal IV is approximately 91%and the,humerus,femur and third wing phalanx are all equal in length and the feet are specially small.It represents the largest boroepterid pterosaur discovered from western Liaoning and its surrounding areas so far 相似文献
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本文报道了浙江东阳发现的中国第2个翼龙足迹化石点, 也是亚洲发现的第8个翼龙足迹化石点。化石足迹产于晚白垩世早期方岩组的紫红色泥质粉砂岩中。发现有3个手的印迹和1个右足印。手的印迹的长宽分别为6.5 cm 和4cm. 非对称具有3个指的印迹。足迹9 cm长和1.5 cm宽。该足迹不同于以前发现的, 可能代表一新的类型。除了翼龙足迹外, 还发现鸟类、小型兽脚类、鸟脚类及蜥脚类脚印, 形成一个丰富的动物群, 它的发现为研究该地区的古生态环境及古地理具有重要意义。同时为以后在该地区发现这些造迹动物的骨骼化石提供了重要依据。 相似文献
9.
Mark Purcell 《GeoJournal》2002,58(2-3):99-108
Much current activism and scholarship has raised concern that the various processes of neoliberal restructuring are threatening democracy. More specifically, researchers in geography and other social sciences have stressed that political and economic restructuring in cities is negatively affecting the enfranchisement of urban residents. Much recent research and writing has explored progressive responses to this perceived disenfranchisement in cities. One popular trend has been a fascination with the idea of the `right to the city' as a way to respond to neoliberal urbanism and better empower urban dwellers. I argue that the right to the city holds promise, but that in the literature the idea remains both theoretically and politically underdeveloped. It remains unclear (1) what the right to the city entails or (2) how it might address current problems of disenfranchisement. This paper examines the right to the city in greater depth. It does so by offering a close reading and analysis of the intellectual roots of the idea: the writings of Henri Lefebvre. I suggest that Lefebvre's right to the city is more radical, more problematic, and more indeterminate than the current literature makes it seem. The paper concludes by suggesting that the right to the city does offer distinct potential for resisting current threats to urban enfranchisement. However, the right to the city is not a panacea. It must be seen not as a completed solution to current problems, but as an opening to a new urban politics, what I call an urban politics of the inhabitant. 相似文献
10.
Since their discovery, pterosaurs have prompted much discussion about their ecology and feeding habits. Most pterosaur specimens are known from marine deposits (Kellner, 2003), though this may represent a bias towards preservation rather than necessarily a habitat choice. Recent discoveries of terrestrial deposits (e.g. the Yixian Formation) have also yielded numerous pterosaurs and our knowledge of their diversity has increased dramatically in recent years. 相似文献
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Brian ANDRES 《《地质学报》英文版》2012,86(6):1356-1365
Phylogenetic analyses of early pterosaur species are relatively new and contradictory. However, they imply a similar evolutionary history for early pterosaurs: a large divergence of all major early groups of pterosaurs before the first named pterosaur species appeared in the fossil record. This large, unsampled divergence may be a record of the initial adaptive radiation of the pterosaurs, but a recent comprehensive phylogenetic analysis reconstructs named Triassic pterosaur species grouped together in a monophyletic clade with all other major groups diverging later. Ten patterns that characterize adaptive radiations put forward by Gavrilets and Losos (2009) are assessed for congruence with the comprehensive phylogeny and two previous phylogenies to determine which are consistent with our notions of an adaptive radiation. Of the eight patterns that can be applied to pterosaurs, only six vary between pterosaur phylogenies. Of these six patterns, all apply to the three phylogenies with varying amounts of support. For many patterns, however, the comprehensive phylogeny has a greater magnitude, shorter time span, or is the only topology within which they can be assessed. Pterosaurs are characterized by an adaptive radiation no matter which phylogeny is considered, but congruence with the fossil record increases the support and information content of a phylogeny by reducing the time and area within which to reconstruct evolutionary history. 相似文献
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Gerald Grellet-Tinner Michael B.Thompson Lucas E.Fiorelli Eloísa Argaaraz Laura Codorniú E.Martín Hechenleitner 《地学前缘(英文版)》2014,5(6):759-765
The increasing number of fossil pterosaur eggs sheds light on nesting environments and breeding be- haviors of these extinct flying reptiles. Here we report the first partial three-dimensional egg of the pterosaur, Pteroduustro guinazui, from central Argentina. The specimen was discovered from the same Albian deposits as the exceptional R guinazui embryo described in 2004. Microscopic characterizations indicate a pristine preservation of the 50 Bm thick calcium carbonate, which differs significantly from the soft shell of Chinese pterosaur eggs. Estimate of the eggshell conductance implies that the nest had a minimum moisture content of 75%. This moisture estimate, combined with geological and taphonomical data, suggests that P. guinazui may have adopted a nesting strategy similar to those of grebes and flamingos rather than being buried on land, as previously hypothesized. Moreover, our results demon- strate that the nesting paleoenvironment of this pterosaur species was closely linked to a mesohaline lacustrine ecosystem in a basin governed by regional tectonic subsidence, a setting characteristic for the feeding and reproduction of modern flamingos. 相似文献
13.
根据发现于辽西朝阳九佛堂组一具有部分头骨的不完整骨架,命名一新的帆翼龙--赵氏龙城翼龙(新属新种).头骨和牙齿形态显示龙城翼龙与宽齿帆翼龙的关系要比与其他翼龙的关系密切,龙城翼龙是目前辽西九佛堂组中发现的唯一的帆翼龙类.帆翼龙科原仅一属种,发现于英国早白垩世地层中,辽西早白垩世新帆翼龙的发现,不但扩大了其地理分布,也证明辽西是晚侏罗世至早白垩世翼龙辐射、分异的重要地区.这对研究翼龙的起源和演化有重要意义. 相似文献
14.
Rico Stecher 《Swiss Journal of Geoscience》2008,101(1):185-201
A new basal non-pterodactyloid pterosaur, Raeticodactylus filisurensis gen. et sp. nov., is reported. It has been discovered in shallow marine sediments from the Upper Triassic of the lowest Kössen beds (late Norian/early Rhaetian boundary) in the central Austroalpine of Canton Grisons (Switzerland). The disarticulated specimen is comprised of an almost complete skull and a partial postcranial skeleton. A high and thin bony, sagittal cranial crest characterizes the anterodorsal region of the skull. The large mandible, with an additional keel-like expansion at the front, partly matches the enlarged sagittal cranial crest. A direct and close relationship to Austriadactylus cristatus, the only known Triassic pterosaur with a bony cranial crest so far, cannot be established. The teeth of the premaxilla are monocuspid and exhibit very strongly bowed enamel wrinkles on the lingual side whereas the enamel is smooth on the labial side. These monocuspid teeth are large and fang-like. The numerous smaller teeth of the maxilla show three, four and five cusps. These are very similar to the teeth of the Triassic pterosaur Eudimorphodon ranzii. The humerus shows a thinner construction than that seen in other Triassic pterosaurs. The femur is quite unusual with a caput femoris perpendicular to the shaft. The bones of the extremities are almost twice as long as the ones from the largest Triassic specimen E. ranzii (MCSNB 2888). The newly described pterosaur is an adult, with a wingspan of approximately 135 cm. A morphofunctional analysis suggests that R. filisurensis was a highly specialized piscivore and possibly a skim-feeder. 相似文献
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中国辽宁西部早白垩世翼龙类化石非常丰富,其上部的九佛堂组翼龙类组合以含有丰富的无齿的古神翼龙科、朝阳翼龙科等进步类型而与下部的义县组翼龙类组合相区别。本文描述了辽宁西部建昌盆地九佛堂组一新的大型翼龙类化石,其以上下颌无齿、吻端指数为3.7、前颌骨背支细长且封闭鼻眶前孔背缘、很大的鼻眶前孔后端超过上下颌关节位置、轭骨的上颌骨突基部宽大而应被归入朝阳翼龙科(Chaoyangopteridae)神州翼龙属(Shenzhoupterus)。其以较大的体形(翼展2.05 m)、平直的上下颌咬合面、轭骨的眶后骨突较泪骨突长且基部略宽、第4～7颈椎长度依次减小等特征,区别于朝阳神州翼龙(Shenzhoupterus chaoyangensis),而被命名为三亚神州翼龙(新种)(Shenzhoupterus sanyainus sp. nov.)。这是辽宁西部早白垩世翼展最大且不具牙齿的翼龙类属种,它的发现丰富了九佛堂组翼龙类组合内容,对认识朝阳翼龙科的骨骼形态与生态习性亦具有积极意义。 相似文献
16.
《Geoforum》2017
Over the past few decades there has been a turn toward ‘the everyday’ in the social sciences and humanities. For some authors, this turn is about making the everyday a new repository of authority of some sort, political, social, cultural or otherwise. For others, however, any turn toward the everyday interrupts any such evaluation. Focusing upon Stanley Cavell and the philosophical lineage that he continues from Emerson, Nietzsche, Thoreau and Wittgenstein, this paper examines Cavell’s interest in the menace and power of scepticism as key to understanding the everyday as a lived experience. As an introduction to this particular part of Cavell’s work for many Geographers, the paper puts Cavell in relation to more familiar approaches to the everyday, including de Certeau, critical Human Geography, non-representational theory, affect theory, psychoanalysis and pragmatism. 相似文献
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Based on a new nearly naturally preserved skull and four cervical vertebrae of the pterosaur Feilongus sp. from the lower Cretaceous Jiufotang Formation of Beipiao, western Liaoning province, northeastern China, the diagnosis of Feilongus is amended. The revised diagnosis notes long, curved, needle-shaped teeth that are confined to the jaw far anterior to the nasoantorbital fenestra; posterior teeth that are slightly smaller than the anterior teeth; cervical vertebrae elongated with a ratio of length to width greater than 5; tooth number of about 78; and two cranial sagittal crests. 相似文献
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David W. E. HONE 《《地质学报》英文版》2020,94(5):1676-1692
The anurognathids are an enigmatic and distinctive clade of small, non-pterodactyloid pterosaurs with an unusual combination of anatomical traits in the head, neck, wings and tail. They are known from very limited remains and few have been described in detail, and as a result, much of their biology remains uncertain. This is despite their importance as potentially one of the earliest branches of pterosaur evolution or even lying close to the origins of pterodactyloids. This review covers the taxonomy and palaeoecology of the anurognathids, which remain an interesting branch of pterosaurian evolution. 相似文献
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A framed water colour of a noctivagous pterosaur by the Reverend G. E. Howman displayed on a wall on the first floor of the Philpot Museum, Lyme Regis, Dorset is the earliest depiction of a restored pterosaur in its life environment. The image is a naïve effort based more on mythology than on fact, but its haunting mood was a harbinger of antediluvian depictions by artists that were to become icons of prehistoric restoration. It predates Henry de la Beche's famous Duria Antiquior by just one year. 相似文献