Dale A. Russell's research while affiliated with Canadian Museum of Nature / Musée canadien de la nature and other places

Publications (19)

Article
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Although pterosaurs from Africa are still rare, in recent years several specimens have been described from the Kem Kem beds (Upper Cretaceous, Cenomanian) of Morocco. Here we describe four additional specimens from this informal lithostratigraphic unit: a jaw fragment, two mid-cervical vertebrae, and a humerus. All these specimens show three-dimens...
Article
Psittacosaur materials were collected from seven localities in the course of Dinosaur Project fieldwork in Inner Mongolia. Two new species of Psittacosaurus are recognized, bringing the number of well-defined species to six. One, based on a nearly complete skeleton, resembles Psittacosaurus mongoliensis, but is a smaller animal with a relatively la...
Article
An articulated neck of a large, mature sauropod, with enormously elongated cervical ribs, was discovered in strata of Late Jurassic age in the eastern Junggar Basin, Xinjiang, People's Republic of China. The animal is estimated to have originally measured 26 m in length, but was lightly proportioned relative to Brachiosaurus and Apatosaurus. Rudime...
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Remains of bipedal saurischians from lacustrine strata of Albian age in the Alxa ("Alashan") Desert of Inner Mongolia represent a new taxon and the most complete remains of an Early Cretaceous theropod so far discovered in Asia. A skeletal reconstruction generally resembles that of a moderately large prosauropod with long arms and a short tail. How...
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Physical and biological evidence supports the probable existence of an enclave of relatively warm climate located between the Southern Appalachian Mountains and the Atlantic Ocean in the United States during the Last Glacial Maximum. The region supported a mosaic of forest and prairie habitats inhabited by a "Floridian" ice-age biota. Plant and ver...
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The fossil record of abelisauroid carnivorous dinosaurs was previously restricted to Cretaceous sediments of Gondwana and probably Europe. The discovery of an incomplete specimen of a new basal abelisauroid, Berberosaurus liassicus, gen. et sp. nov., is reported from the late Early Jurassic of Moroccan High Atlas Mountains. Phylogenetic analysis re...
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The fossil record of abelisauroid carnivorous dinosaurs was previously restricted to Cretaceous sediments of Gondwana and probably Europe. The discovery of an incomplete specimen of a new basal abelisauroid, Berberosaurus liassicus, gen. et sp. nov., is reported from the late Early Jurassic of Moroccan High Atlas Mountains. Phylogenetic analysis re...
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The Early Jurassic dinosaur site of Toundoute which yielded the basal sauropod Tazoudasaurus naimi is examined in the light of its stratigraphic, sedimentological and palaeoenvironmental context. A thin succession of Early Liassic marine carbonates (probably Hettangian-Sinemurian in age) is continuously overlain by continental beds with dinosaurs....
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Continental strata of Early Jurassic age are seldom exposed, and little is known of the history of sauropod dinosaurs prior to the Middle Jurassic radiation of neosauropods. Well-preserved skeletons and skulls have not been recovered from strata older than the Middle Jurassic. Here we report, in the Early Jurassic of the Moroccan High Atlas, the di...
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5 ABSTRACT: We report the occurrence of an isolated avian dorsal vertebra in Cretaceous strata of Morocco. The specimen was found near Erfoud oasis in the Tafilalt region of southeastern Morocco preserved in a reddish sandstone. It has a large neural canal (ratio height neural canal/cranial articulation surface = 0.67), a feature regarded as a syna...
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Recent studies of the oceanic record suggest that the Earth was a global greenhouse during middle Cretaceous time. A review of topographic, sedimentary and biologic data pertaining to terrestrial mid-Cretaceous equatorial environments broadly supports the climatic inferences of marine studies. In particular, analyses of widely-occurring low latitud...
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Computerized tomography scans of a ferruginous concretion within the chest region of an ornithischian dinosaur reveal structures that are suggestive of a four-chambered heart and a single systemic aorta. The apparently derived condition of the cardiovascular system in turn suggests the existence of intermediate-to-high metabolic rates among dinosau...
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The nearly complete skeleton of a large sauropod discovered at Wawmda (High Central Atlas of Morocco) in strata of Bathonian-Callovian age represents a new taxon: Atlasaurus imelakei n.g., n.sp. The sauropod appears to be closer to Brachiosaurus than any other known sauropod, but possesses (relative to the length of the dorsal vertebral column) a l...
Article
A ponderously constructed ornithischian dinosaur, Lurdusaurus arenatus, nov.g., nov.sp., from the Aptian of Niger resembles extinct giant ground sloths in general body form. Details of its skeletal anatomy indicate a close affinity to European iguanodontids of Early Cretaceous age.
Article
Variability of body temperature within fossil vertebrates can be measured by the oxygen isotopie composition of bone phosphate (δp). Intrabone and interbone δp variations indicate heat flow within an individual and can be used to establish thermoregulatory strategies such as homeothermy and regional heterothermy. This method is applied to an indivi...
Article
New occurrences of spinosaurid dinosaurs from the Aptian of Niger and Albian of Algeria augment our knowledge of Spinosaurus maroccanus and permit the description of a new taxon: Cristatusaurus lapparenti from the Gadoufaoua locality (Niger). Spinosaurs may be separated into two distinct groups: one with longirostrine muzzles and premaxillae which...

Citations

... The beginning of the Toarcian was a major break in the evolution of theropods. The families Coelophysidae and Dilophosauridae disappeared during the Toarcian, but new basal Ceratosauria are recorded in the Toarcian such as Berberosaurus from Morocco (Allain et al., 2007) and Dandakosaurus from India (Yadagiri, 1982) (Figs. 5 and 7). After the Jenkyns Event, during the late Toarcian the first species of Allosauroidea is recorded, Asfaltovenator vialidadi from Cañadón Asfalto Basin (Argentina; Rauhut and Pol, 2019) at around 8 m length (Figs. 5 and 8) as well as the first megalosauroids of Family Piatnitzkysauridae (Condorraptor and Piatnitzkysaurus; Rauhut, 2005;Carrano et al., 2012). ...
... The Epapatelo otyikokolo (MGUAN-PA650) humerus displays an entepicondyle that is wider than the ectepicondyle in dorsoventral width, with the ectepicondyle of the humerus projecting anteriorly (a pteranodontid feature) [17,33]. The entepicondyle projects distally, a feature shared with nyctosaur A. elainus [17] and azhdarchoid CMN 50814 [60] (CMN: Canadian Museum of Nature, Ottawa, Canada). This gives the humerus a strong distal expansion that is also similar to Pteranodon sp., T. regalis, and A. elainus, a derived feature of non-Nyctosaurus pteranodontoids, but different from azhdarchoids that only have an expansion of the distal one-third of the humerus [17]. ...
... Consequently, many of them let the temperature of some areas of the body drop to reduce their energy need and limit heat losses (Irving and Hart, 1957;Rommel et al., 1992;Eichhorn et al., 2011). On the other hand, some ectotherms are able to produce heat locally (Carey, 1982;Block, 1986;Dickson and Graham, 2004) to improve visual acuity in cold environment (Block, 1987;Fritsches et al., 2005), swim faster or migrate over longer distances (Bernal et al., 2001;Blank et al., 2007;Watanabe et al., 2015). These two strategies lead to temperature heterogeneities called regional het-N. ...
... As in most styracosternan ornithopods the articular facets of the haemal arches are fused differing from those of Lurdusaurus arenatus in which the articular facets are totally separated [37]. The best preserved haemal arches present straight shaft differing from the posteriorly curved and pointed shafts from the first three haemal arches of Iguanodon bernissartensis [24] and Jinzhousaurus yangi [38] or the first haemal arch of Mantellisaurus atherfieldensis [25] or the probably first haemal arch of Morelladon beltrani [11]. ...
... Several other geographical regions preserved diverse eusauropod faunas, including some potential Middle Jurassic neosauropods (Fig. 37), and brief comparisons are made below. Monbaron et al. 1999;Sereno et al. 1999;Upchurch & Martin 2003;Buffetaut 2005;Mahammed et al. 2005;Rauhut & L opez-Arbarello 2009;Remes et al. 2009;L€ ang and Mahammed 2010;Mannion 2010;Raveloson et al. 2019). Many African sauropod remains are poorly preserved and they have seldom been included in phylogenetic analyses due to a lack of useful anatomical detail. ...
... Original Author and/or Origin of the Name: Faure, 1954; the town of Elrhaz References: Faure, 1966;Taquet, 1976;Buffetaut & Taquet, 1977;Buffetaut & Taquet, 1979;de Lapparent de Broin, 1980;Taquet, 1982;Galton & Taquet, 1982;Fabre et al., 1983;Sereno et al., 1994Sereno et al., , 1998Taquet & Russell, 1998, 1999Wenz, 1999;Sereno et al., 2001;de Lapparent de Broin, 2002;Blackburn & Sereno, 2002;Sereno et al., 2003;Rogers et al., 2005;Sereno & Brusatte, 2008;Sereno & Larsson, 2009;Le Loeuff et al., 2010Sereno & ElShafie, 2013; Web-05. ...
... The earliest known sauropods were discovered in Late Triassic units-Norian stage-of Zimbabwe (McIntosh, 1990;Raath, 1972;Yates and Kitching, 2003) and Late Norian or Rhaetian units of Thailand (Buffetaut et al., 2000(Buffetaut et al., , 2002 (Fig. 1). Basal sauropods, here we mean sauropods more basal than Neosauropoda, also appeared sporadically in Early to Middle Jurassic localities of China, India, Europe, South America and Africa (e.g., Phillips, 1871;Raath, 1972;Weishampel, 1992;Monbaron et al., 1999;Buffetaut et al., 2000;Allain et al., 2004;Stumpf et al., 2015) (Fig. 1). They became more diversified phylogenetically and flourished in both hemispheres from the Middle Jurassic to the end of the Late Jurassic (Sereno, 1999a), possibly due to the breakup of Pangea (Chatterjee and Zheng, 2002). ...
... Herbivores are rare, with only occasional remains of sauropod dinosaurs reported (Lamanna and Hazegawa, 2014;Ibrahim et al., 2016), of which Rebbachisaurus is the only named taxon (Lavocat, 1954a). A diverse assemblage of crocodylomorphs is present (Sereno and Larsson, 2009), in addition to turtles (Gaffney et al., 2002;Gaffney et al., 2006), snakes (Rage andDutheil, 2008;Klein et al., 2017) amphibians (Rage andDutheil, 2008) and possibly birds (Riff et al., 2004). ...
... It is worth noting, however, that most of the "Protiguanodon" holotype (AMNH FARB 6253) skull weathered away before collection, leaving only a partial mandible and skull table for study (Osborn, 1923). Sereno (2010) extensively revised the taxonomy of Psittacosaurus, finding that nine of the proposed species were valid: Psittacosaurus mongoliensis (Osborn, 1923), Psittacosaurus sinensis (Young, 1958), Psittacosaurus xinjiangensis (Sereno and Chao, 1988), Psittacosaurus meileyingensis , Psittacosaurus neimongoliensis (Russell and Zhao, 1996), Psittacosaurus sibiricus (Averianov et al., 2006), Psittacosaurus lujiatunensis (Zhou et al., 2006), Psittacosaurus major (Sereno et al., 2007), and Psittacosaurus gobiensis . Recently, P. lujiatunensis and P. major, both of which are known from the Lujiatun beds of the Yixian Formation, were found to form one morphometric cluster using 3D geometric morphometrics (Hedrick and Dodson, 2013), leading the authors to pronounce P. major a junior synonym of P. lujiatunensis. ...
... This is also true in compsognathids and Scipionyx (Currie & Chen, 2001;Dal Sasso & Maganuco, 2011). However, Nqwebasaurus and therizinosauroids possess a proximally broad mc II (Barsbold, 1976;Russell & Dong, 1994;De Klerk et al., 2000;Clark, Marya nska & Barsbold, 2004) and this also appears to be the case in tyrannosaurids (Lambe, 1917;Russell, 1970;Carpenter & Smith, 2001;Brochu, 2003;Holtz, 2004). ...