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本文描述了产自中国辽宁省北票市早白垩世义县组一新的伤齿龙类化石——柯氏辽宁猎龙(Liaoningvenator curriei gen. et sp. nov.)。它具有伤齿龙类以下特征: 数量众多且密集的上颌齿与下颌齿; 牙齿的齿冠与齿根之间显著收缩; 齿骨侧表面具有一沟, 营养孔位于该沟内; 远端尾椎背部的神经棘减弱为一个沟。它不同于其它伤齿龙类的特征主要为坐骨靴大, 侧面观近乎三角形, 坐骨闭孔突细长; 尾椎形态转变点位于第7尾椎。系统发育分析表明柯氏辽宁猎龙与短羽始中国羽龙(Eosinopteryx brevipenna)构成姊妹群, 位于同一分支内。它们具有如下共同特征: (1)上颌骨和下颌骨前面部分的牙齿前隆无锯齿; (2)颈肋较其相关节的椎体长; (3)肠骨前缘直。辽宁猎龙代表了辽西同等层位发现的第5个伤齿龙类。骨组织研究显示辽宁猎龙的骨骼已接近成熟, 死亡时至少4岁。它为该地区的基干伤齿龙类恐龙提供了新的解剖学信息, 并丰富了目前中国已知早白垩世伤齿龙类的多样性。 相似文献
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《地球学报》2017,(3)
本文描述了产自中国辽宁省北票市早白垩世义县组一新的伤齿龙类化石——柯氏辽宁猎龙(Liaoningvenator curriei gen.et sp.nov.)。它具有伤齿龙类以下特征:数量众多且密集的上颌齿与下颌齿;牙齿的齿冠与齿根之间显著收缩;齿骨侧表面具有一沟,营养孔位于该沟内;远端尾椎背部的神经棘减弱为一个沟。它不同于其它伤齿龙类的特征主要为坐骨靴大,侧面观近乎三角形,坐骨闭孔突细长;尾椎形态转变点位于第7尾椎。系统发育分析表明柯氏辽宁猎龙与短羽始中国羽龙(Eosinopteryx brevipenna)构成姊妹群,位于同一分支内。它们具有如下共同特征:(1)上颌骨和下颌骨前面部分的牙齿前隆无锯齿;(2)颈肋较其相关节的椎体长;(3)肠骨前缘直。辽宁猎龙代表了辽西同等层位发现的第5个伤齿龙类。骨组织研究显示辽宁猎龙的骨骼已接近成熟,死亡时至少4岁。它为该地区的基干伤齿龙类恐龙提供了新的解剖学信息,并丰富了目前中国已知早白垩世伤齿龙类的多样性。 相似文献
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研究新疆准噶尔盆地奇台地区晚侏罗世石树沟组一接近完整的蜥脚类恐龙右侧股骨,发现其不仅具有典型巨龙型类恐龙特征,而且还有许多独具特征,如经过股骨近端的侧向膨大部分最远点的实际延伸直线与股骨头背面实际延伸直线成约127°夹角;第四转子发育明显,侧视呈土丘状;第四转子位于股干中间偏上靠近内侧;髁间凹发育呈"U"型;远端关节面与骨干间有一小的夹角。虽然只有股骨保存,但根据特征对比及地层时代和地理分布因素,其代表了一种新的大型巨龙型类恐龙,故建立新属新种:奇台傅山龙(Fushanosaurus qitaiensis gen. et sp. nov.)。 相似文献
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发现于内蒙古鄂托克旗召稍早白垩世罗汉洞组的一件不完整翼龙类下颌标本,以下颌愈合部长且平直、齿骨侧嵴发育、近圆形齿窝沿侧嵴之上的齿骨侧面上半部分自前向后呈直线排列、齿窝直径(2~2.5 mm)前后变化较小、相邻齿窝的间距约为齿窝直径的一半、下颌牙齿密度为3枚/cm等特征,可归入梳颌翼龙科(Ctenochasmatidae),且代表一新属种——郝氏鄂托克翼龙Otogopterus haoae gen.et sp.nov.。该化石是继鄂托克旗新召准噶尔翼龙科的平颌鄂尔多斯翼龙Ordosipterus planignathus之后在内蒙古鄂尔多斯地区发现的第2件确切翼龙类材料,丰富了这一地区早白垩世脊椎动物群的组成。该翼龙也是继甘肃庆阳环河翼龙Huanhepterus quingyangensis之后在鄂尔多斯盆地发现的第2种梳颌翼龙科化石,进一步扩大了鄂尔多斯盆地梳颌翼龙科的地理分布范围,同时表明鄂尔多斯盆地是继辽宁西部之后梳颌翼龙科在中国的又一重要分布区。 相似文献
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兰州—民和盆地位于中国西北横跨甘肃和青海两省的毗连地区,其中广泛发育出露良好下白垩统河口群。近年来,在该盆地东部的兰州盆地产出了一个前所未知的脊椎动物组合,其中以诸多的足印化石和世界已知最大牙齿的植食性恐龙——巨齿兰州龙(Lanzhousaurus magnidens)为代表,还包括一类宽臀的基干巨龙型类蜥脚类——刘家峡黄河巨龙(Huanghetitan liujiaxiaensis),以及许多其他尚未发表的恐龙、鱼类和龟类。本文报道在该地区河口群中所发现的第二种新的蜥脚类恐龙——炳灵大夏巨龙(新属新种)(Daxiatitan binglingi gen.et sp.nov.)。炳灵大夏巨龙的正型标本现存于甘肃省地矿局第三地质矿产勘查院古生物研究开发中心(兰州)。该标本包括最后的10枚颈椎,10枚背椎,2枚近端尾椎,部分颈肋和背肋,1枚脉弓,右肩胛骨,右乌喙骨和右股骨。估计其颈部长度为12.2m,整个身体长度为26m,使其成为中国乃至亚洲最大的恐龙之一。大夏巨龙是巨龙类的一个基干分子[其支干定义为:与盐龙(Saltasaurus)而不与腕龙(Brachiosaurus)更具亲缘关系的巨龙型类],其以如下特征区别于其他巨龙类分子:颈椎的前关节面后移;肩胛骨骨体的远缘与其长轴斜交;股骨远端髁相对于股骨体向背侧方倾斜10°,而且从远端看,该远端髁处于后内—前侧方向。大夏巨龙独特的股骨构造指示出一种强烈外撇的走步姿态。同时,这种姿态也得到了保存于刘家峡恐龙国家地质公园同一层位(河口群上段)的强烈外转的、宽间距的蜥脚类恐龙行迹的进一步佐证。炳灵大夏巨龙的发现丰富了兰州盆地脊椎动物组合,对研究巨龙类恐龙的起源和早期演化具有重要意义。 相似文献
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辽宁凌源义县组恐龙皮肤印痕化石 总被引：1，自引：0，他引：1
辽宁西部凌源大王杖子义县组恐龙皮肤印痕化石的发现，是热河生物群中恐龙皮肤鳞片的又一次记录。这些鳞片的形态以不规则多边形为主、互不叠覆，同时鳞片的大小、排列方式等随其着生部位的不同而明显变化。从与该皮肤鳞片保存在一起的数枚上颌齿及部分前后肢骨来判断，这一恐龙化石应归鸟臀类，且极有可能为鹦鹉嘴龙类(psittacosaurids)。 相似文献
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依据采自广西扶绥县早白垩世那派组的部分蜥脚类头后骨骼化石,建立了一新属新种:赵氏扶绥龙(Fusuisaurus zhaoigen.etsp.nov.)。赵氏扶绥龙的正型标本包括左肠骨、左耻骨、前部尾椎、大部分的背肋和左股骨的远端。新属种具有的独特组合特征区别于已知的蜥脚类恐龙,如肠骨前突腹背侧强烈扩张,前突侧视呈半圆形,但前突的前缘与腹缘交界处明显呈锐角,腹缘明显凹入。扶绥龙具有巨龙形类恐龙的一些共近裔性状,比如耻骨的坐骨关节面较为纵深,前部背肋呈板状,耻骨突前的肠骨板明显高于其后的肠骨板,但扶绥龙缺少巨龙类恐龙的一些进步特征,如背肋缺… 相似文献
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人类为获取食物和满足其他需求而使用牙齿从事的各类非咀嚼性活动在牙齿表面形成使用痕迹。牙齿使用痕迹与古人类的行为特征关系密切,记录了丰富的古人类生存环境、食物构成、获取食物的方式、行为模式及生活习俗等方面的信息。对黄龙洞更新世晚期人类牙齿的观察发现:黄龙洞人类前部牙齿表面具有釉质破损与崩裂、齿冠唇面破损、齿间邻接面沟3种类型的使用痕迹。根据这些牙齿使用痕迹的分布和表现特点,推测生活在黄龙洞的更新世晚期人类经常使用前部牙齿从事啃咬、叼衔、或剥离坚韧的食物或非食物物品等活动,并可能将前部牙齿作为工具使用;齿间邻接面沟提示当时人类经常从事剔牙活动。结合已经在黄龙洞发现的其他人类活动证据,我们认为当时人类可能从事狩猎活动,食物构成中包含有较多的肉类及粗纤维植物。 相似文献
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Three eusauropod teeth (SDUST-V1064, PMOL-AD00176, PMOL-ADt0005) are reported from the Lower Cretaceous Yixian Formation of Ningcheng, southeastern Inner Mongolia, China. Two of them (SDUST-V1064, PMOL-AD00176) are assigned to early-diverging titanosauriforms in having slightly mesiodistal expansion at the base of the tooth crown, a slenderness index value >2.0 and <4.0, and D-shaped cross section. Furthermore, SDUST-V1064 and PMOL-AD00176 are referred as an Euhelopus-like titanosauriform on the basis of having a sub-circular boss on the lingual surface and an asymmetrical crown-root margin which slants apically, respectively. 相似文献
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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
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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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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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The Late Jurassic Archaeopterygidae, comprising the iconic genus Archaeopteryx, is altogether among the earliest, basalmost and best-known Mesozoic avian taxa. The geographic distribution of Archaeopteryx is hitherto restricted to a limited region of southern Germany, probably due to preservation biases. Here we describe a tooth sorted among the more than 35,000 isolated teeth found by sieving sediments from the Cherves-de-Cognac locality (western France, Lower Cretaceous). This tooth crown is morphologically similar to teeth of the German specimens of Archaeopteryx (sensu lato), despite minor differences. The Cherves-de-Cognac tooth differs much more importantly from all other known taxa. It shares with different specimens of Archaeopteryx the general tooth size, recurved shape affecting apical third of crown, thin apical-mesial carina, constriction at base of crown giving distinctive S shape of distal edge in profile, absence of other ornamentation or serration, and shape of crown section. Incidentally, former assignments of teeth from the Upper Jurassic of Guimarota (Portugal) to cf. Archaeopteryx are unwarranted, as those teeth markedly differ from the Archaeopterygidae in several crucial features. We assign the new tooth to the family Archaeopterygidae, the earliest European birds, making it the first member of the family in Europe outside Germany, and extending its temporal occurrence to the early Cretaceous. 相似文献
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The Early Cretaceous Zhidan Group in the northern Ordos Basin, Inner Mongolia, yielded a large number of tetrapods, including turtles, choristoderes, crocodyliforms, psittacosaurs, stegosaurs, theropods and birds. Well-preserved sauropod teeth have been found in the Luohandong Formation, a middle-upper unit of the Zhidan Group. The large V-shaped wear facet, low slenderness index value, labial grooves, lingual ridge and concavity on the tooth crown suggest that these teeth are from titanosauriforms. Moreover, the presence of the prominent bosses on the lingual side of the tooth crown indicates these teeth should be identified as Euhelopus teeth further. The existence of Euhelopus in Ordos Basin (Inner Mongolia), Shandong Province and western Liaoning Province shows some connections about vertebrate faunas during Early Cretaceous in these areas. Other tetrapod groups such as turtles (Sinemys, Ordosemys), choristoderes (Ikechosaurus), psittacosaurs (Psittacosaurus) and birds (Cathayornis) provide more evidences for this viewpoint. 相似文献
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Pangupterus liui gen. et sp. nov. from the Jiufotang Formation of Sihedang, Lingyuan City, Liaoning Province is erected based on a nearly complete lower jaw. It is characterized by having a total of 36 slender curved teeth with sharp tips, forming a distinct fish-grabbing mechanism; the teeth are well-spaced and are circular in section; the length ratio of the mandibular symphysis to the whole jaw is 20%; and the ratio of the tooth root width to tooth length is 12%. Toothed pterosaurs make up about 56.3% of the pterosaur assemblage from the Jiufotang Formation, which indicates that toothed forms played a key role in the ecosystem. 相似文献
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To date three taxa of troodontid theropod dinosaurs have been recognized from Upper Cretaceous strata in two regions of the Kyzylkum Desert in Uzbekistan. The Cenomanian Khodzhakul Formation in the southwestern Kyzylkum Desert has yielded isolated serrated teeth and some postcranial bones of an indeterminate troodontid. In the central Kyzylkum Desert troodontids are known from the Cenomanian Dzharakuduk Formation (Urbacodon itemirensis) and the Turonian Bissekty Formation (Urbacodon sp.). Urbacodon itemirensis is known from a single dentary whereas Urbacodon sp. is represented by isolated teeth, maxilla and dentary fragments, a partial braincase, and some postcranial bones. The troodontid affinities of Urbacodon are supported by several synapomorphies: presence of a subotic recess; reduced basal tubera placed directly under the occipital condyle; maxilla participating in the margin of the external naris; nutrient foramina on dentary situated within a deep lateral groove; dentary without distinct interdental plates; large number of small dentary and maxillary teeth; teeth constricted between root and crown; anterior dentary teeth smaller, more numerous, more closely spaced than those in the middle of the tooth row, and implanted in a groove; posterior dorsal vertebrae with tall and posterodorsally tapering neural spines; and presence of a midline sulcus on the neural arches of distal caudals. Among Troodontidae, Urbacodon resembles Byronosaurus, Gobivenator, and Xixiasaurus in the absence of serrations on the tooth crowns and having premaxillary teeth that are D-shaped in cross-section. However, phylogenetic analysis did not recover a clade of Asiatic troodontids with unserrated teeth. 相似文献
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A nearly complete right maxillary or left dentary tooth（NHMG 10858） from the Lower Cretaceous Xinlong Formation of the Napai Basin, Fusui County, Guangxi, southern China, is described. The tooth is large in size, with a CBL of 37 mm. Given the geological age and its crown morphology, including the size, it is most likely that the tooth belongs to a carcharodontosaurid. The recovered specimen represents one of the largest theropod teeth hitherto reported from the Early Cretaceous of Asia. 相似文献