members in both size and abundance were herbivorousdiadectids, and it was unlikely to encounterlarge predators.2008040428加 拿 大 不 列 颠 哥 伦 比 亚 晚 三 叠 世 Pardonet 组鱼 龙 一 新 属 : 架 起 三 叠 纪 - 侏 罗 纪 间 隙 的 桥 梁= A new genus of ichthyosaur from the Late TriassicPardonet Formation of British Columbia:bridging the Triassic Jurassic gap. ( 英 文 ).Nicholls E L; Manabe M. Canadian Journal ofEarth Sciences, 2001, 38(6): 983-1002Both the genus Shastasaurus and the familyShastasauridae have long been hard to definedue to the fragmentary nature of the type specimens.Consequently, recent interpretations of thegenus have been based almost entirely on Shastasaurusneoscapularis from the Late TriassicPardonet Formation of British Columbia. Twonew specimens of this taxon, from Pink Mountain,British Columbia, demonstrate that it doesnot belong in the genus Shastasaurus. This paperdescribes the new specimens, and refers the speciesto Metashastasaurus gen nov. Post-cranially,the skeleton of Metashastasaurus resembles thatof shastasaurids, differing primarily only in theshape of the scapula and fibula. However, theskull has a unique combination of characters,including large diamond-shaped frontals thatenter the supratemporal fenestrae, and very narrowposterior extensions of the nasals, whichcontact the postfrontals. It also differs from theskull of Shastasaurus in the presence of both aparietal ridge and postparietal shelf. This is acombination of derived characters previouslyknown only in Jurassic forms. The front limb hasfour proximal carpals and four digits, indicatingthat previous reconstructions were based on incompletematerial. Shastasaurus pacificus Merriam1895, the type species of the genus Shastasaurus,must be considered a nomen dubium,making the genus Shastasaurus invalid. Untilthis problem is clarified, the use of the genericname Shastasaurus should be restricted to Merriam'stype specimens, of which only Shastasaurusalexandrae and Shastasaurus osmonti arebased on adequate material.2008040429晚 白 垩 世 恐 龙 Maiasaura peeblesorum 运 动时 的 个 体 发 育 = An ontogenetic perspective onlocomotion in the Late Cretaceous dinosaurMaiasaura peeblesorum (Ornithischia: Hadrosauridae).( 英 文 ). Dilkes D W. Canadian Journalof Earth Sciences, 2001, 38(8): 1205-1227Ontogenetic growth in the forelimb andhindlimb of the dinosaur Maiasaura peeblesorum(Ornithischia: Hadrosauridae) from theUpper Cretaceous (Campanian-Maastrichtian)Two Medicine Formation of Montana is investigatedby multivariate and bivariate morphometricsand the biomechanics of beam theory. Resultssupport a hypothesis of an age-dependentselection of stance. Juveniles walked primarilyas bipeds. As an individual matured, its predominantstance shifted to quadrupedality.Within the forelimb, morphometric results showa probable allometric enlargement of posturalmuscles, an allometric increase in the lever armsof protractor muscles, and an increased robustnessof the humerus to enhance its resistance tobending stresses. In contrast, the hindlimb ischaracterized by a relative decrease in the resistanceof the femur and tibia to bending stresses.In addition, there is an allometric enlargement ofthe femoral fourth trochanter and positive allometryof the lengths of metatarsals III and IV.The most likely explanation for the differentgrowth patterns is that the hindlimb was sufficientlyrobust at a young age to accommodateincreased postural and locomotory stressesthrough largely isometric growth, whereas a behavioralshift to quadrupedality in older individualsnecessitated an allometric response inthe forelimb. Osteological adaptations forweight-bearing in the manus include metacarpalsthat are united firmly with a resultant crosssectionalshape that is resistant to bending andhyperextendable joints between the metacarpalsand first phalanges. It is probable that flexormuscles that attached to the caudal surface of themetacarpals reinforced the reduced carpus andlessened the likelihood of collapse during quadrupedality.2008040430加 拿 大 艾 伯 塔 南 部 恐 龙 公 园 组 角 龙Chasmosaurus 属 一 新 种 = A new species ofChasmosaurus (Dinosauria: Ceratopsia) from theDinosaur Park Formation of southern Alberta.( 英 文 ). Holmes R B; Forster C; Ryan M; ShepherdK M. Canadian Journal of Earth Sciences,2001, 38(10): 1423-1438Chasmosaurus irvinensis (sp. nov.) is distinguishedfrom other species of this genus by thepossession of a broad snout, absence of a browhorn (the position of which is occupied by a pitor rugosities suggestive of bone resorption),broadly rounded and open jugal notch, subrectangularsquamosal, straight posterior parietalbar bearing 10 epoccipitals, eight of which areflattened, strongly curved anterodorsally, andnearly indistinguishably coossified to theirneighbours, and small, transversely oriented parietalfenestrae restricted to the posterior portionof the frill. This species, restricted to the upperpart of the Dinosaur Park Formation, is significantlyyounger than the other recognized CanadianChasmosaurus species, C. belli and C. rus-132
selli. Phylogenetic analysis shows that C. irvinensisis most closely related to the other CanadianChasmosaurus species and more distantlyrelated to……2008040431新 疆 准 噶 尔 盆 地 Dracochelys 的 新 材 料 = Newmaterial of Dracochelys (Eucryptodira: Sinemydidae)from the Junggar Basin, Xinjiang, People'sRepublic of Chin. ( 英 文 ). Brinkman D B.Canadian Journal of Earth Sciences, 2001,38(12): 1645-1651A new specimen of Dracochelys bicuspisdocuments the lower jaws and postcranial skeletonof this taxon. A close relationship with Hangaiemysis supported by the presence of nineneural bones, with the sulcus between the fourthand fifth vertebral scute crossing the ninth neural.The two taxa differ in the contacts of the firstperipheral, shape of the vertebral scutes, andpattern of fenestration of the plastron. Dracochelysdiffers from "Sinemys" wuerhoensis and "S. "efremovi, which also occur in the Tugulu Group,in features of the carapace, especially the arrangementof the posterior neurals and suprapygals.2008040432中 国 东 北 部 松 辽 平 原 下 白 垩 统 一 新 鳄 类 的 头盖 骨 解 剖 = Cranial anatomy of a new crocodyliform(Archosauria: Crocodylomorpha) fromthe Lower Cretaceous of Song-Liao Plain, northeasternChina. ( 英 文 ). Wu X-C; Cheng Z-W;Russell A P. Canadian Journal of Earth Sciences,2001, 38(12): 1653-1663Rugosuchus nonganensis, a new genus andspecies of crocodyliform, is erected on the basisof its peculiar cranial features. This late EarlyCretaceous species represents the second, andmost complete, crocodyliform known fromnortheastern China. Its discovery is significantfor our understanding of both the local vertebratefauna and its stratigraphical correlations, and thepaleobiogeography of the Crocodyliformes. Thepalatine contribution to the anterior border of thechoana excludes the new form from the Eusuchia,and evidence from osteoderms (not detailedin the present paper) suggests that the new formappears to be phylogenetically closer to theEusuchia than to the Goniopholididae. Therefore,comparisons are made primarily with those taxawhich have a closer relationship to the formerthan the latter. The unsculpted, depressed, andlobe-like posterolateral process of the squamosalis further demonstrated to be ontogeneticallyvariable and thus inappropriate for use as a characterin phylogenetic analyses.2008040433对 Leidyosuchus canadensis 的 回 顾 及 根 据 新材 料 对 头 盖 骨 变 异 的 评 价 = A review ofLeidyosuchus canadensis Lambe, 1907 (Archosauria:Crocodylia) and an assessment ofcranial variation based upon new material. ( 英文 ). Wu X-C; Russell A P; Brinkman D B. CanadianJournal of Earth Sciences, 2001, 38(12):1665-1687Cranial morphology of Leidyosuchus canadensisLambe 1907 is reviewed based on previouslyundescribed material—seven skulls andeight mandibles. This species can be distinctivelydiagnosed by more than 10 derived features.New information supports the contentionthat L. canadensis is the sole representative ofLeidyosuchus, and indicates that it is very differentfrom the other species previously assigned tothis taxon. The membership of L. canadensiswithin Alligatoroidea is also demonstrated bynew information revealed in this study. Ontogeneticand individual variation in the cranial anatomyof L. canadensis are documented. The contactof the premaxillary–maxillary suture withthe incisive foramen is not diagnostic of thetaxon; rather, it exhibits individual variation.Leidyosuchus is endemic to North America.There was no faunal interchange of crocodyliformsbetween North America and central Asiaduring the last two stages of the Late Cretaceous.2008040434加 拿 大 艾 伯 塔 南 部 红 鹿 河 峡 谷 古 新 世 底 部 初龙 亚 纲 一 新 鳄 类 化 石 = A new crocodylian(Archosauria) from the basal Paleocene of theRed Deer River Valley, southern Alberta. ( 英 文 ).Wu X-C; Brinkman D B; Fox R C. CanadianJournal of Earth Sciences, 2001, 38(12): 1689-1704Borealosuchus griffithi, sp. nov., is describedon the basis of an incomplete skeleton from thebasal Paleocene, southern Alberta. This newspecies records one of a few basal Cenozoic occurrencesof Crocodylia so far known. B. griffithiis most distinctive in having a markedlylaterally concavo-convex snout; a deep, elongaterecess or fossa on the anteroventral surface ofthe jugal; and a large, nearly rectangular incisiveforamen. Within Borealosuchus, B. griffithiprobably takes a "more crownward" positionthan does B. sternbergii of the late Late Cretaceous.With additional information from the newspecies, the diagnosis of Borealosuchus is revised.2008040435新 疆 准 噶 尔 盆 地 Urho 地 区 的 Psittacosaurusxinjiangensis 发 现 = The occurrence of Psittacosaurusxinjiangensis Sereno and Chow, 1988in the Urho area, Junggar Basin, Xinjiang, Peo-133
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第 4 卷 第 4 期古 生 物 学
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Fossils, i.e. remains of living org
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nus, a new ichnospecies of Fuersich
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以 松 柏 类 和 盾 籽 类 为
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Island, Papua New Guinea. ( 英 文
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A C. Canadian Journal of Earth Scie
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mated depositional interval of 10 t
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北 海 古 近 纪 一 种 新 型
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scabrate-verrucate, and rugulate mi
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the Tetori Group in the Kuzuryu are
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during the Late Pleistocene are rec
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ane have been previously reported f
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Albian-early Paleocene in the Anady
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Poaceae and Plantago lancelata. shr
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the eastern segment of its southern
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member of the La Despedida Formatio
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lembaye (Maastricht region) and fro
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tion the ontogenetic stage of the p
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早 期 种 子 植 物2008040123
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中 国 内 蒙 古 东 北 部 晚
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2008040137辽 西 北 票 中 侏
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综 论2008040144低 PH 值 对 Amm
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ut poorly studied. Dimorphism (or t
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and migration towards the sediment-
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schackoinids, indicating that the e
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( 英 文 ). Nomaki H; Yamaoka A; S
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新 西 兰 Otago 南 海 岸 全
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Scotland. ( 英 文 ). Murray J W.
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A three-year sediment trap experime
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a habitat disturbance and is nearly
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Pitted surfaces associated with wal
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Saanich than exists today sedimento
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2008040208大 堡 礁 区 域 绿
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was pulsed, with major declines usu
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mycelium, was observed where reticu
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suggest that reticulopodia are self
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to OIS 3, compared to the more stab
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Patterson R T. Journal of Foraminif
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known xenophyophore species grouped
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aminiferal Research, 2001, 31(4): 2
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lankovitch-scale frequency. Analyse