建设中的自贡恐龙博物馆

我国第一个专业性恐龙博物馆正在四川自贡市大山铺恐龙化石埋藏现场动工兴建。这是我国继西安半坡博物馆、西安兵马俑博物馆之后的又一个大型现场博物馆,一个在一亿多年前被大自然埋藏的“恐龙群窟”。大山铺恐龙化石于1972年夏由地矿部第二地质大队科技人员发现,1977年10月至1984年6月经中国科学院古脊椎动物与古人类研究所、四川省恐龙发掘队、自贡市恐     

四川自贡发现罕见的恐龙化石埋藏层

从1979年12月起,中国科学院古脊椎动物与古人类研究所、自贡市盐业历史博物馆、重庆市博物馆,在四川省石油局川西南汽矿综合队的协助下,在自贡市郊大山铺发掘了一处恐龙化石埋藏层。化石埋藏于一大的砂岩透镜体中,透镜体暴露的长度近40米,宽约12米,厚度最大处达4米。含化石层可分4层,化石密集,保存较完好,这是一个罕见的恐龙化石埋藏体。1972年,该化石产地即由国家地质总局第七普查大队发现,并报告了中国科学院古脊椎动物与古人类研究所。1977年进行了试掘,采获一条大型的原始蜥脚类恐龙,该恐龙化石被命名为蜀龙(Shunosaurus),     

四川自贡化石木研究

研究了发现于四川省自贡市距著名的大山铺恐龙化石坑０．５～３ｋｍ处的几株化石木。它们的地质时代与大山铺恐龙动物群相同,地层层位大致相当,属于中侏罗世的下沙溪庙组和新田沟组。根据解剖结构特征,确定它们属于原始的松柏类植物———南洋杉型木属中的一个新种,命名为自贡南洋杉型木新种（ＡｒａｕｃａｒｉｏｘｙｌｏｎｚｉｇｏｎｇｅｎｓｉｓＤｕａｎｓｐ．ｎｏｖ．）。化石木的发现对探讨恐龙的生活环境有重要的意义。     

物探技术寻找地下恐龙

我国专家首次运用物探手段在四川省自贡市大山铺寻找恐龙化石 ,在基本确定了恐龙化石层的分布、化石富集区等情况后 ,日前已成功发掘出一具深处 9米地层下的恐龙化石。四川自贡大山铺中侏罗纪恐龙化石群产地是一处享有国际声誉的地质古生物遗址 ,化石藏量之大、属种之多、保存之好在世界相同地质年代的恐龙产地中首屈一指 ,填补了世界上中侏罗纪恐龙化石缺乏的薄弱环节 ,对研究恐龙的早中期演化具有十分重要的意义。自贡恐龙博物馆副馆长彭光照介绍说 ,这一化石群的二期开发工程的关键性技术难题是要弄清待建区域 (8.9平方公里 )内 ,恐龙化…     

三列齿类爬行动物化石在新疆的发现

本文报道的三列齿类化石是该类动物在我国西北地区之首次出现,与四川自贡所产大山铺恐龙动物群中的自贡似卞氏兽(Bienotheroides zigongensis)归同属同种,故认为五彩湾组可与下沙溪庙组相对比。新标本的发现在若干形态特征上补充了以往记述之不足。     

恐龙家族中的新成员:武定昆明龙

恐龙,是一群早已绝灭的形态奇特的爬行动物,它们生活在205百万年前的晚三叠世到65百万年前的晚白垩世,它们曾独霸了地球的陆地达一亿四千万年之久。在这个漫长的时间里,恐龙世代繁衍,形成种类繁多、大小各异的庞大家族。在我国辽阔的疆土上,埋藏着丰富的恐龙化石。从东部的山东至西域的新疆、青藏,从南国的云南和两广到北疆的内蒙古和黑龙江,分布着数以百计的化石地点,其中有世界闻名的早期恐龙化石产地一云南禄丰;海拔四千多公尺的大马拉山侏罗纪蜥脚类恐龙化石地点一西藏昌都大马拉山,被誉为“恐龙群窟”的四川自贡大山铺;亚洲第一大龙产地合川太和镇……。     

自贡恐龙博物馆

自贡恐龙博物馆黄大喜（自贡恐龙博物馆四川６４３０００）自贡恐龙博物馆位于四川省自贡市大山铺。它是依托于被誉为“恐龙群窟，世界奇观”的恐龙公墓而修建的，属于古生物化石遗址博物馆。大山铺中诛罗世（距今１．６亿年前）恐龙化石埋藏遗址，是在１９７９年１２月四...     

东北地区新发现的更新世化石地点

<正> 近年来,东北三省在文物普查和地质调查过程中,陆续发现了许多珍贵的历史文物和一些新的哺乳动物化石地点,这就使东北地区考古和古生物的研究工作又有了新的进展。黑龙江省自嘉阴恐龙化石和扎赉诺尔化石地点发掘以来,在1982年,哈尔滨近郊阎家岗一个重要的晚更新世新化石地点被发现,这是一处典型的披毛犀-猛犸象动物群产地,化石层位在众所周知的顾乡屯组中。另外,在著名的哈尔滨黄山地层中时有哺乳动物化石和人工打击石片的发现。吉林省前郭旗青山头、乾安大布苏、长春市郊以及延边自治州均有哺乳动物化石点发现,其中青山头和大布苏已进行了系统的发掘,时代均为     

“龙腾中原——‘路易贝贝’及中原巨龙特展”在北京自然博物馆举办

<正>河南,中原巨龙的故乡上世纪80年代以来,河南以恐龙蛋的产地而出名,一时间,人们认为河南盛产恐龙蛋,而恐龙化石却相对匮乏。但是近十年来,河南众多恐龙研究成果的公布,特别是汝阳盆地早白垩世的汝阳巨型蜥脚类恐龙动物群和潭头盆地晚白垩世的栾川动物群的发现,让大家对河南的恐龙资源得以重新认识。自2006年以来,河南省地质博物馆与中国地质科学院地质研究所合作,在中国科学院古脊椎动物与古人类研究所董枝明研究员的指导     

自贡恐龙博物馆试展

经近两年的紧张施工,我国第一座恐龙博物馆——自贡恐龙博物馆一期建设工程已基本完工,并在春节期间开放了部份展厅试展。修建在著名的恐龙化石产地——大山铺的大型自然博物馆,占地约二万五千平方米,分为馆舍、附属建筑、绿化地带三部分。馆舍建筑面积六千平方米。造型独特、别致、新颖,其外形模拟天然砂岩岩块     

四川自贡中侏罗世璧山上龙一新种

2001年春,自贡市永安乡村民王新民在自家花园附近的紫红色沙质泥岩里发现一批脊椎动物化石。自贡恐龙博物馆接到报告后,由舒纯康同志前往调查处理,并将这批化石发掘回馆。该化石为一具不完整蛇颈龙类骨架,因其左后肢带骨较完整,有必要对它进行报道。     

四川自贡大山铺蜀龙动物群——简报Ⅲ.蜥脚类

本文记述了中侏罗世蜥脚类一新属种——巴山酋龙(Datousaurus bashanensts gen. et sp. nov.)对李氏蜀龙(Shunosaurus lii)的特征进行了补充,讨论了它们在蜥脚类进化过程中的位置。     

四川自贡大山铺蜀龙动物群——简报Ⅳ.兽脚类

建设气龙 (Gasosaurus constructus gen. et sp. nov.) 为自贡大山铺蜀龙动物群中的兽脚类—新属种.本简报对它的形态特征进行了简要的记述.     

四川自贡蜥脚类一新属

记述了产自四川省自贡市的一具蜥脚类幼年个体材料。根据枢椎极短而高,颈神经棘低、上缘平直、前后延长,背神经棘呈横宽的板状,中部颈肋的前突分叉等特征将它命名为一新属新种——张氏大安龙Daanosaurus zhangi gen.etsp.nov.,并将它归入巧龙亚科Bellusaurinae。     

A new sauropodomorph dinosaur from the Early Jurassic of Patagonia and the origin and evolution of the sauropod-type sacrum

Background

The origin of sauropod dinosaurs is one of the major landmarks of dinosaur evolution but is still poorly understood. This drastic transformation involved major skeletal modifications, including a shift from the small and gracile condition of primitive sauropodomorphs to the gigantic and quadrupedal condition of sauropods. Recent findings in the Late Triassic–Early Jurassic of Gondwana provide critical evidence to understand the origin and early evolution of sauropods.

Methodology/Principal Findings

A new sauropodomorph dinosaur, Leonerasaurus taquetrensis gen. et sp. nov., is described from the Las Leoneras Formation of Central Patagonia (Argentina). The new taxon is diagnosed by the presence of anterior unserrated teeth with a low spoon-shaped crown, amphicoelous and acamerate vertebral centra, four sacral vertebrae, and humeral deltopectoral crest low and medially deflected along its distal half. The phylogenetic analysis depicts Leonerasaurus as one of the closest outgroups of Sauropoda, being the sister taxon of a clade of large bodied taxa composed of Melanorosaurus and Sauropoda.

Conclusions/Significance

The dental and postcranial anatomy of Leonerasaurus supports its close affinities with basal sauropods. Despite the small size and plesiomorphic skeletal anatomy of Leonerasaurus, the four vertebrae that compose its sacrum resemble that of the large-bodied primitive sauropods. This shows that the appearance of the sauropod-type of sacrum predated the marked increase in body size that characterizes the origins of sauropods, rejecting a causal explanation and evolutionary linkage between this sacral configuration and body size. Alternative phylogenetic placements of Leonerasaurus as a basal anchisaurian imply a convergent acquisition of the sauropod-type sacrum in the new small-bodied taxon, also rejecting an evolutionary dependence of sacral configuration and body size in sauropodomorphs. This and other recent discoveries are showing that the characteristic sauropod body plan evolved gradually, with a step-wise pattern of character appearance.     

新疆一新蜥脚类

本文记述了新疆中侏罗世蜥脚类恐龙的克拉美丽龙新亚科的一新属种——戈壁克拉美丽龙,并对新亚科的建立及其所属地质时代进行了分析讨论。     

A new primitive protozoan devouring centric diatoms in the plankton

A new primitive protozoan Asterocaelum algophilum gen. et sp. nov., is described from the plankton of Loch Leven, Scotland where it was found primarily feeding on the centric diatoms Stephanodiscus rotula (Kütz) Hendey and Cyclotella pseudostelligera Hustedt. Stages in its life cycle consist of a trophic amoeba, a cyst from which the protoplasm emerges as one or several units similar to the amoeboid stage and a resting cyst containing a double walled resting spore. The amoeboid stage produces numerous clear hyaline pseudopodia which are often broad based and taper apically and within which a core of denser material, possibly an axial filament, is sometimes seen. The cyst and resting cyst stages externally bear long tapering empty spines formed by the laying down of a wall and subsequent emptying of the protoplasm from a number of rather stiff radiating processes produced by the amoeboid stage. All external surfaces are surrounded by an envelope of mucilage and the walls laid down by this organism give a positive reaction for cellulose. The similarity of its life cycle to that of the vampyrellids is noted.     

四川自贡发现合川马门溪龙新材料

记述了产自四川自贡上侏罗统的一具较完整的蜥脚类恐龙骨架 ,将其归入合川马门溪龙 (Mamenchisaurushochuanensis)中。新材料的发现弥补了合川种正型标本的不足 ,对合川种的特征作了重要补充 ,同时也使我们对马门溪龙的末端尾椎形态有了新的认识。     

Structure of anterior dorsal ventricular ridge in snakes.

Anterior dorsal ventricular ridge (ADVR) is a major subcortical, telencephalic nucleus in snakes. Its structure was studied in Nissl, Golgi, and electron microscopic preparations in several species of snakes. Neurons in ADVR form a homogeneous population. They have large nuclei, scattered cisternae of rough endoplasmic reticulum in their cytoplasm, and bear dendrites from all portions of their somata. The dendrites have a moderate covering of pedunculated spines. Clusters of two to five cells with touching somata can be seen in Nissl, Golgi, and electron microscopic preparations. The area of apposition may contain a series of specialized junctions which resemble gap junctions. Three populations of axons can be identified in rapid Golgi preparations of snake ADVR. Type 1 axons course from the lateral forebrain bundle and bear small varicosities about 1 mu long. Type 2 axons arise from ADVR neurons and bear large varicosities about 5 mu long. The origin of the very thin type 3 axons is not known; they bear small varicosities about 1 mu long. The majority of axon terminals in ADVR are small (1 mu to 2 mu long), contain round synaptic vesicles, and form asymmetric active zones. This type of axon terminates on dendritic spines and shafts and on somata. A small percentage of terminals are large, 5 mu in length, contain round synaptic vesicles, and form asymmetric active zones. This type of axon terminates only on dendritic spines. A small percentage of terminals are small, contain pleomorphic synaptic vesicles, and form symmetric active zones. This type of axon terminates on dendritic shafts and on somata.     

Cypripedium subtropicum,a New Species Related to Selenipedilum

Cypripedium subtropicum S. C. Chen et K. Y. Lang is a phytogeographycally significant new species with its habit, inflorescence and column very similar to those of Selenipedilum of tropical America. It is found in Mêdog of southeastern Xizang, China. Its slender leafy stem bears at the summit a many-flowered raceme, amounting to 1.5 m in height. Although its ovary is unilocular—this is the reason why we place it in Cypripedium, the column characters resemble those of Selenipedilum. For example, the staminode is rather small and its long stalk is very similar in texture and color to the filament of the fertile stamens. Obviously, it is a primitive new species related to Selenipedilum based on the similarities mentioned above. In the subfamily Cypripedioideae, as generally recognized, Selenipedilum is the most primitive genus, from which or whose allies Cypripedium is derived. Of phytogeographical significance is the fact that Selenipedilum occurs in Central America and northern South America, while a cypripedium akin to it is discontinuously distributed in subtropical Asia. This suggests that Selenipedilum or Selenipedilum-like form be once continually distributed in North America and eastern Asia when the climate there was warmer, as it is in the subtropics today. The floristic relationship between Central America and subtropical Asia appears to be closer than expected, as shown by the distribution patterns of Tropidia, Erythrodes, etc. Based on the occurrence of all six sections and particularly the most primitive form in eastern Asia, Cypripedium seems to be of Asian, rather than Central American, origin. Selenipedilum possesses some very primitive characters, such as trilocular ovary, vanilla-scented fruit, seed with sclerotic testa, simple column and more or less suffrutescent habit. The latter is considered by Dahlgren & Clifford (1982) to be one of ancestral characters of monocotyledons, which is now very rare not only in Orchidaceae but also in all monocotyledons. It is indeed necessary to make further investigations on Selenipedilum and also the new species pub-lished here, as well as a detailed comparison between them.